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1)How can we predict the total number of elements in a given period?
Answer: the number of orbitals filled by an energy level multiplied by 2
2) Give an example for a “s” block element:

Answer: lithium

3) Write the electronic configuration of the above element:

Answer: 1s2 ,2s1
4) Predict why it belongs to s block element:
Answer: the last subshell filled belongs to s orbital
5) Why carbon is called as a “p” block element?

Answer: the differentiating electrons belong to p orbital

6) Is Zinc a ‘d’ block element? Give reason .

Answer: differentiating electrons of zinc enter d orbital
7)What are lanthanoids?

Answer: elements in the f block from cerium(59) to lutetium(71)

8) What are actinoids?

Answer: elements in the f block from thorium(90) to lawrencium(103)
9) what are representative elements?
Answer: elements in the s and p block are called representative elements.
10) what is the difference between Transition elements and inner transition elements?
Answer: elements present in the d block are called transition elements and elements belonging to f block are called inner transition elements.

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13) Identify the nature of each block elements

| Block | Metal, non metal, metalloids, radioactive, solid, liquid, gases.
| s | Metal, solid
| p | Metalloid, non-metal, liquid, gas, solid
| d |                                                Metal, radioactive, solid
| f | Radioactive, solid

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12)How many gaseous elements are there in the periodic table? Write the symbol of all the gaseous elements in the periodic table?

Answer: H, He, N, O, Ne, Ar, Se, Kr, Xe, Rn, F, Cl

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10) what is the difference between Transition elements and inner transition elements?

Answer: Transition elements are found in d block. Whereas inner transition elements are found in f block.

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14)Write the symbol of metalloids in the periodic table

Answer: B, Si, Ge, As, Sb, Bi, Po

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15)Which is the liquid non-metal in the periodic table?

Answer: Bromine

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16) Name all the noble gases in the periodic table

Answer: Helium, Neon, Argon, Krypton, Xenon and Radon.

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17) What are the merits of the periodic table?

Answer: 1. Elements are placed in a very systematic and structured way, according to their increasing reactivity, atomic radius, mass and no.of protons.

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18) What are the demerits of the periodic table?

Answer: Lanthanoids and actinoids are separated from the main periodic table and position of hydrogen is not fixed.

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13. Identify the nature of each block elements.

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13. Identify the nature of each block elements.

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s -> Metal, Solid
p -> Non-metal, Metalloid, Liquid, Gas, Solid
d -> Metal, Solid, Radioactive
f -> Solid, Radioactive

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18. What are the demerits of the periodic table

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18. What are the demerits of the periodic table

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However, there are some flaws in the periodic table. For instance, Hydrogen is a conundrum as it resembles both the alkali metal and the halogen group so there is some confusion on where to place it. The placement of the lanthanoids and actinoids lead to confusions and makes it harder to interpret and compare and contrast with other elements.

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17. What are the merits of the periodic table?

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17. What are the merits of the periodic table?

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The periodic table is very organized in most aspects. It also shows increasing/decreasing order of atomic radius, ionization energy, orbitals, and more.

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15. what is the only liquid non metal on the periodic table

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15. what is the only liquid non metal on the periodic table

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Bromine (Br) is the only liquid non-metal in the periodic table.

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14. Write the symbol of metalloids in the periodic table

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14. Write the symbol of metalloids in the periodic table

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B, Si, Ge, As, Sb, Te, Po, At

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16. Name all the noble gases in the periodic table

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16. Name all the noble gases in the periodic table

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Helium, Neon, Argon, Krypton, Xenon, Radon

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4. Predict why Lithium belongs in the "s" block

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4. Predict why Lithium belongs in the "s" block

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It belongs to the "s" block as its last orbital is an "s" orbital and its last outermost electron is in an "s" orbital.

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3. Write the electron configuration of the element in question 2

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3. Write the electron configuration of the element in question 2

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Lithium has the electron configuration of 1s²2s¹

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2. Give an example for an "s" block element

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2. Give an example for an "s" block element

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Lithium is an example of an "s" block element

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12. How many gaseous elements are there in the periodic table? Write the symbol of all the gaseous elements in the periodic table?

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12. How many gaseous elements are there in the periodic table? Write the symbol of all the gaseous elements in the periodic table?

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There are 11 gases in periodic table.
- hydrogen (H)
- nitrogen (N)
- oxygen (O)
- fluorine (F)
- chlorine (Cl)
- helium (He)
- neon (Ne)
- argon (Ar)
- krypton (Kr)
- xenon (Xe)
- radon (Rn)

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1. How can we predict the total number of elements in a given period?

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1. How can we predict the total number of elements in a given period?

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You can assess how many elements are in a period by multiplying the number of orbitals by 2.

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Answer: The position of Hydrogen is not fixed

Acitinoids and lanthanoids are place in separate groups outside the periodic table

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17)What are the merits of the periodic table?

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17)What are the merits of the periodic table?

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Answer:  The placement of isotopes was justified

The periodic table became easier to understand with atomic number and trends

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16)Name all the noble gases in the periodic table

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16)Name all the noble gases in the periodic table

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Answer: Helium , Neon, Argon, Krypton, Xenon, Radon, Oganesson

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15)Which is the liquid non-metal in the periodic table?

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15)Which is the liquid non-metal in the periodic table?

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Answer:Bromine

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14)Write the symbol of metalloids in the periodic table

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14)Write the symbol of metalloids in the periodic table

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Answer: B, Si, Ge, As, Sb, Te, Po

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13) Identify the nature of each block elements

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13) Identify the nature of each block elements

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| s | Metal/solid
| p | Metalloids, non-metals, Gases
| d |  Metals
| f |  Radioactive/Metals

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13) Identify the nature of each block elements

| Block | Metal, non metal, metalloids, radioactive, solid, liquid, gases.
| s |  Solid & non-metals
| p |  Metaloids, liquid, gases & solid
| d | Metals, solids
| f | Metals, radioactive

14)Write the symbol of metalloids in the periodic table

Answer: Boron(B), Silicon(Si), Astatine(As), Tellurium(Te)

15)Which is the liquid non-metal in the periodic table?

Answer: Bromine

16)Name all the noble gases in the periodic table

Answer: Helium , neon , argon , Xenon, kryton & Radon

17)What are the merits of the periodic table?

Answer: .

·         The classification of elements is based on the atomic number, which is a more fundamental property.

·          It explains the periodicity of the properties of the elements and relates them to their electronic configurations.

·          The reason for placing isotopes at one place is justified as the classification is on the basis of atomic number.

·         The position of the elements that were misfits on the basis of mass number (anomalous pairs like argon and potassium) could be justified on the basis of atomic number.

·          The lanthanides and actinides are placed separately at the bottom of the

periodic table.

·          The table is simple, systematic and easy way for remembering the properties of various elements as it is based on the electronic configuration.

18)What are the demerits of the periodic table?

Answer:

·          Hydrogen resembles both the alkali metals and halogens. But it has been placed with the alkali.

·         The lanthanides and actinides have not been placed in the main body of the table.

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9) what are representative elements?

Answer: Elements in s and p block collectively is called as representative elements.

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7) What are lanthanoids?

Answer: Elements that come after Lanthanum are called as lanthanoids. Its basically from Cerium to Lutetium.

8) What are actinoids?

Answer: Elements that come after Actinium are called as actinoids. Its basically from Thorium to Lawrencium

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6) Is Zinc a ‘d’ block element? Give reason

Answer: [Ar] 4s²,3d¹⁰. From its clear that Zinc belongs to d block.

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4) Predict why it belongs to s block element:Answer: differentiating electrons enters in to the s block.5) Why carbon is called as a “p” block element?Answer: 1s2, 2p2, 2p6 . From its clear that differentiating electrons enters in to the p block.

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4) Predict why it belongs to s block element:Answer: differentiating electrons enters in to the s block.5) Why carbon is called as a “p” block element?Answer: 1s2, 2p2, 2p6 . From its clear that differentiating electrons enters in to the p block.

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12)How many gaseous elements are there in the periodic table? Write the symbol of all the gaseous elements in the periodic table?
Answer: 11. H,He,N,O,F,Ne,Cl,Ar,Kr,Xe,Rn.

13) Identify the nature of each block elements
Block Metal, non metal, metalloids, radioactive, solid, liquid, gases.
s
Metals,solids,Radioactive
p
Metalloids,Non-metal,Radioactive,Solids,Liquids and Gases.
d Metals,Solids,Radioactive
f Metals,Non-metals,Radioactive,Solids

14)Write the symbol of metalloids in the periodic table
Answer: C, Si, Ge, Sb
tellurium and polonium

15)Which is the liquid non-metal in the periodic table?
Answer: Br

16)Name all the noble gases in the periodic table
Answer: He,Ne,Ar,Kr,Xe,Rn.

17)What are the merits of the periodic table?
Answer: Elements with similar properties can be identified under which block they occur. The periods and groups in a periodic table also help to identify the Electronic Configuration of an element.

18)What are the demerits of the periodic table?
• Answer: Elements with two or more valencies have been represented in the periodic table corresponding to only one valency.
• A definite place for Hydrogen in the periodic table has not been allotted. It comes under both Group 1 and 17.

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1)How can we predict the total number of elements in a given period?

Answer:

We can look at the principle quantum number of the elements and predict.

2) Give an example for a“s” block element:

Answer: Beryllium

3) Write the electronic configuration of the above element:

Answer: 1s², 2s²

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Representative elements comprise of elements in the "s" and "p" block due to its predictable orbital pattern.

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18)What are the demerits of the periodic table?

Answer:  1. Lanthanoids and actinoids are placed separate from main body.

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What are the merits of the periodic table?

Answer:
1. Elements are arranged in their increasing order of atomic number.

2. Elements which their differentiating electron fall into the same orbital are placed together.

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14)Write the symbol of metalloids in the periodic table

Answer: B, Si, Ge, As, Sb, Bi, Po
not Bi but tellurium

15)Which is the liquid non-metal in the periodic table?

Answer: Bromine

16)Name all the noble gases in the periodic table

Answer: He, Ne, Ar, Kr, Xe, Rn

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Identify the nature of each block elements

Block  | Metal, non metal, metalloids, radioactive, solid, liquid, gases.
s  | Metal, solid
p  |  Metalloid, non metal, liquid, gas, solid
d  | Metal, Radioactive, solid
f  | Radioactive, solid

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6. Is Zinc a 'd' block element? If so, why?

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6. Is Zinc a 'd' block element? If so, why?

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The electron configuration for Zinc (Zn) is 1s²2s²2p⁶3s²3p⁶4s²3d10 or [Ar]4s²3d¹⁰. The outermost orbital is in the "d" block, therefore Zinc is a "d" block element.

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Lanthanoids are 14 elements that come in the periodic table after the element Lanthanum (La). The series starts from element Cerium (Ce) and ends at Lutetium (Lu).

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Actinoids are 14 elements that come in the periodic table after the element Actinium (Ac). The series starts from element Thorium (Th) and ends at Lawrencium (Lr).

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9) what are representative elements?

Answer: All sand p block elements are Representative elements.

10) what is the difference between Transition elements and inner transition elements?

Answer: Transition elements are the elements from Group3 to Group 12.

Inner transition elements are the f block elements.

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What are lanthanoids?

Answer: They are f block elements which have similar properties. They are elements after lanthanum. There are 14 elements from Cerium to Lutetium.

8) What are actinoids?

Answer: They are f block elements which have similar properties. They are elements after actinium. There are 14 elements from Thorium to Lawrencium.

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12)How many gaseous elements are there in the periodic table? Write the symbol of all the gaseous elements in the periodic table?Answer: there are 11 gaseous elements Oxygen(O), nitrogen(N) , hydrogen(H),  fluorine(F) , chlorine(Cl) & all the noble gases-Neon(Ne), Helium(He), Argon(Ar), Krypton( Kr), Xenon(Xe), Radon(Rn)

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12)How many gaseous elements are there in the periodic table? Write the symbol of all the gaseous elements in the periodic table?Answer: there are 11 gaseous elements Oxygen(O), nitrogen(N) , hydrogen(H),  fluorine(F) , chlorine(Cl) & all the noble gases-Neon(Ne), Helium(He), Argon(Ar), Krypton( Kr), Xenon(Xe), Radon(Rn)

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11) Write the general electronic configuration of the s,p,d and f block elements

| Block | General electronic configuration
| s | (Noble Gas) ns¹⁻²
| p | (Noble Gas) ns2  np¹⁻⁶
| d | (Noble Gas) ns²   nd¹⁻¹⁰
| f | (Noble Gas)   nd ¹⁰ nf ¹⁻¹⁴

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ach block elements can be represented by general electronic configurations. To write a general electronic configuration of a given block element, the core electronic configuration is taken as that of the nearest noble gas electronic configuration. Outer electronic configuration is written by considering out most shell as nth shell. (n-1)th shell as penultimate shell and (n-2)th shell as anti-penultimate shell.

11) Write the general electronic configuration of the s,p,d and f block elements

Block  | General electronic configuration
s  | [Noble Gas] ns1-2
p  |  [Noble Gas] ns2 np1-6
d  |  [Noble Gas] ns0-2 n-1d1-10
f  | La - [Xe] ns2 n-1d0-1 n-2f2-14
Ac - [Rn] ns2 n-1d0-1 n-2f0-14

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10) what is the difference between Transition elements and inner transition elements?

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10) what is the difference between Transition elements and inner transition elements?

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Answer: Transitional elements are d block elements. Inner transitional elements are f block elements. So Transitional elements are from group 3 -12. Inner transition cannot be put in groups.

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10) what is the difference between Transition elements and inner transition elements?

Answer: transition elements have differentiating electrons in the d orbital

Inner transition elements have differentiating electrons in f orbital

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s and p block elements

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9) what are representative elements?

Answer: All s block and p block elements are called representative elements. They represent repeating pattern of electronic configulation.

10) what is the difference between Transition elements and inner transition elements?

Answer: Transition metal are d block elements. Inner transition elements  are f block elements.

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Answer: Lanthanoids are elements which come after Lanthanum. These are 14 elements after Lanthanum which come in f shell and they are accommodated outside. If they are included in periodic table it will affect the placement of other elements.

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9) what are representative elements?Answer: they consist of all theelements from group 1,2,13,14,15,16,17,18.They are not transition metals because they do not have the features of a transition metal

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9) what are representative elements?Answer: they consist of all theelements from group 1,2,13,14,15,16,17,18.They are not transition metals because they do not have the features of a transition metal

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they are s block and p block elements
they fill in regular manner

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Answer: Acitinoids are elements which come after Actinium. These are 14 elements after Actinium which come in f orbital and they are accommodated outside. If they are included in periodic table it will affect the placement of other elements similar to lanthanoids

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7) What are lanthanoids?

Answer: Lanthanoids is a period of 14 elements with atomic number from 58(Cerium) to 71(Lutetium). It is found at the bottom of the periodic table.

8) What are actinoids?

Answer: Actinoids is a period of 14 elements with atomic number from 90(Thorium) to 103(Lawrencium). It is found at the bottom of the periodic table.

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6) Is Zinc a ‘d’ block element? Give reason 

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6) Is Zinc a ‘d’ block element? Give reason 

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Answer: As electronic Configuration of zinc is [Ar] 4s² 3d¹⁰. As differentiating electrons enter in d orbital. So zinc is d block element.

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5) Why carbon is called as a “p” block element?

Answer: 1s2 2s2 2p4. Their differentiating electron fall into p block.

6) Is Zinc a ‘d’ block element? Give reason

Answer:1s2 2s2 2p6 3s2 3p6 4s2 3d10 Their differentiating electron fall into d block.

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5) Why carbon is called as a “p” block element?

Answer: because the differentiating orbital is in the p orbital

6) Is Zinc a ‘d’ block element? Give reason

Answer: (Ar) 4s²  3d10  is the electronic configuration of Zn.

The differentiating electron is filled in d orbital , 4s and 3d orbital have similar energy

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Answer: As carbon’s electronic configuration is [HE] 2s² 2p². As Differentiating electrons enters in respective orbital P . So carbon is a P block element

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1) How can we predict the total number of elements in a given period?

Answer: Number of orbital fill in given energy level multiple by 2.

Periodic table is divided into different blocks. Called s,p,d,f. Group 1 and 2 are called s block elements. Group 13 to 18 are called p block elements. Group 3 to 12 are called d block elements. While elements belonging to lanthanoids and actinoids are called ‘f’ block elements.

2) Give an example for a “s” block element:

Answer: Mg, Li

3) Write the electronic configuration of the above element:

Answer: Mg – 1s2 2s2 2p6 2s2

Li – 1s2 1s1

4) Predict why it belongs to s block element:

Answer: Their last orbital is s

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1)How can we predict the total number of elements in a given period?Answer: Depending on the number of orbitals present 

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1)How can we predict the total number of elements in a given period?Answer: Depending on the number of orbitals present 

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2) Give an example for a “s” block element:

Answer:  Sodium

3) Write the electronic configuration of the above element:

Answer: (Ne) 3s1

4) Predict why it belongs to s block element:

Answer: this is because the last orbital filled is t Block s

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1)How can we predict the total number of elements in a given period?
Answer: Number of electrons in the valence shell(with respect to the energy level diagram) of the last element in the period indicates the total number of elements in the period.
2) Give an example for a “s” block element:

Answer: Sodium.

3) Write the electronic configuration of the above element:

Answer: 1s2, 2s2, 2p6, 3s1
4) Predict why it belongs to s block element:
Answer: The last subshell filled is the s-subshell.
5) Why carbon is called as a “p” block element?

Answer: The differentiating electron enters the p-subshell.

6) Is Zinc a ‘d’ block element? Give reason .

Answer: Yes Zinc is a d block element. Its atomic number is 30 and the differentiating electron enters the d subshell.

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Number of orbitals filled in the given energy level multiplied by

2) Give an example for a “s” block element:

Answer: Hydrogen

3) Write the electronic configuration of the above element:

Answer:1s¹

4) Predict why it belongs to s block element:

Answer: It belongs to s block element as its valency is 1. Group 1 elements have valency 1 . S block is also the first orbital