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JY'LAH JONES WILL BE YOUR NEXT CHIEF JUSTICE AND I FEAR NO MAN, AND WILL DIE FOR MY PEOPLE. LOVE YOU GUYS, YALL WILL ALWAYS REMEBER ME!!!!!!!!!!!!!

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- The elements in group 1 are known as the ALKALI METALS.
-  The reaction of an element are determined by the number of electrons in the outer shell of their atoms.
- MELTING point DECREASES down group 1
- The Element in group 17 are known as the HALOGENS.
- Lithium, sodium, and Potassium are all less dense than water.
- In a REDOX REACTION more reactive Halogen oxidises a less reactive halide ion.

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- Atomic Radius - basically used to describe an atom.
* Atomic radius increases down a group and decreases across a period.
* It is possible to define two different atomic radii: the covalent radius and the van der Waal's radius.
* In general, the ionic radii of positive ions are smaller than their atomic radii, and the ionic radii of negative ions are greater than their atomic radii.
* Down any group in the periodic table, the first ionization energy decreases.
* The general trend is that first ionization energy increases from left to right across a period. This is because of an increase in nuclear charge across the period.
* First electron affinity - involves the energy change when one electron is added to a gaseous atom: X(g)+e- = X-(g)
* Electronegativity is a measure of the attraction of an atom in a molecule for the electron pair in the covalent bond of which it is a part.

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-Oxides of elements may be classified as basic, acidic or amphoteric.
-metallic oxides=basic
-non-metallic oxides=acidic
-Amphoteric oxides react both with acids and with bases
-Two of the most environmentally important are nitrogen(II) oxide and nitrogen oxide(IV).
-Nitrogen acts with oxygen at very high temperatures to form NO.
-NO2 can be classified as an acidic oxide.
-N2O is another neutral oxide.

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-  Oxides of elements may be classified as basic, acidic, or amphoteric.
- The nature of the oxides changes across a period.
- Metallic oxides are basic and non-metallic oxides are acidic.
- Nitrogen reacts with oxygen at very high temperatures to form NO.
- There are many oxides of Nitrogen, raging in formula from N2O to N2O5.
- Two of the most environmentally important are nitrogen(II) oxide (NO) and nitrogen (IV) oxide (NO2).
- N2 + O2 = 2NO
- This reaction occurs in the internal combustion engine.
- NO can be oxidised in the atmosphere to NO2, which can react with water to produce nitric acid.

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3.1 The Periodic Table
*The element in the periodic table are arranged in order of atomic number starting with hydrogen, which has atomic number 1
*The groups are the vertical columns in the periodic table and the periods are the horizontal rows.
*The majority of the elements are metals while, some are metalloids and others are non-metals
*The symbols of the elements that are solid at room temperature and pressure are in black, whereas the gases are in red and liquids are in blue
*The metallic and non-metallic properties of elements can be related to ionization energies.
*In general, metallic elements tend to have large atomic radii, low ionization energies, less exothermic electron affinity values and low electronegativity.
3.1.1 The Periodic Table and Electron Configurations
*Electrons in the outer shell of an atom are sometimes called valence electrons.
*The group number of an element is related to the number of valence electrons.
*All the elements in group 1 have 1 valence electron; all the elements in group 2 have 2 valence electrons.
*For elements in groups 13-18, the number of valence electrons is given by (group number - 10)
*The periodic table is divided into blocks according to the highest energy subshell (sub-level) occupied by electrons. So in the s block all the elements have atoms in which the outer shell electron configuration is ns^1 or ns^2 and in the p block it is the p subshell that is being filled.
*The noble gases have either two or eight electrons in their outer shell.
*Helium belong in the s block because its highest energy occupied subshell is 1s, but it is usually put in group 18 with the other noble gases.
*The modern periodic table has developed from one originally conceived  by Russian chemist Dmitri Mendeleev in 1869.
*Mendeleev suggested that the elements were arranged in order of atomic weight and produced a table in which elements with similar chemical properties were arranged in vertical groups.
*Mendeleev suggested that some elements had not been discovered and left spaces for them in his table. Not only did he leave spaces but he also predicted the properties of these unknown elements. His predictions were extremely accurate.
*Henry Moseley established the connection between atomic number and the periodic table. Like Mendeleev, he realized that there were still some elements to be discovered and proposed that three elements between Al and Au were yet to be discovered.

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separate into groups and write the main parts of:
3.1 and 3.1.1
3.2.1
3.2.2
3.2.3