Electron structure

First shell can hold

2 electrons

2nd and 3rd shell can hold

8 electrons

no of shells =

Period on the periodic table

Valence electrons

Outer shell electrons which are involved in reactions

No of valence electrons =

Group number on the periodic table

Hydrogen electron structure

1

Nitrogen electron structure

2,5

Argon electron structure

2,8,8

Potassium electron structure

2,8,8,1

Calcium electron structure

2,8,8,2

Aluminium electron structure

2,8,3

Magnesium electron structure

2,8,2

Oxygen electron structure

2,6

Fluorine electron structure

2,7

Carbon electron structure

2,4