Electron arrangement

Electron shells

Electron shells naturally want to have a full outer shell

Level of shell Number of electrons
1st level 2
2nd level 8
3rd level 8

Image result for electron shell with number model 2,8,8

Relationship between electron shells and the periodic table

Image result for periodic table and electron shells gcse


Ions are elements which have had electrons added or removed,  giving them a charge.

Cation vs Anion

Cation: An ion with less electrons than normally. It has a positive charge .

Anion: An ion with more electrons than normally. It has a negative charge.


Types of bonding

Bonding name Type of elements Diagram
Covalent Simple molecular Non-metal and  Non-metal Image result for covalent bond
Giant molecular Carbon or Silicon with itself. Image result for giant covalent
Metallic Metal and Metal Image result for Metallic bond
Ionic Non-metal and metal Image result for Ionic bond diaGRAM

Lewis structures

A lewis structure is a diagram specifically for Covalent bonding Which shows which electrons are shared in the bond of a molecule.

How to draw it:

Example diagram

Image result for Lewis structure


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