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. 

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 

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 

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 

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

 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. 

 

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

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

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

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.

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.

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

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. 

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

Answer: transition elements have differentiating electrons in the d orbital 

Inner transition elements have differentiating electrons in f orbital 

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. 

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.

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

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

 | Block | General electronic configuration
 | s | (Noble Gas) ns^1-2 
| p | (Noble Gas) ns²  np^1-6 
| d | (Noble Gas) ns²   nd^1-10
| f | (Noble Gas)   nd¹⁰ nf^1-14  

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   

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 

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. 

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

 | 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.

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

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

Answer:Bromine

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

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

Answer: The position of Hydrogen is not fixed

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

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

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

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

Answer: Bromine  

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

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

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

 | 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  

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.