Question

REVISION WORK

Q1-Write down the electronic configuration of elements from atomic number 1 to 20.​

Answer 1

Hydrogen- 1

Helium- 2

Lithium-2,1

Beryllium- 2,2

Boron- 2,3

Carbon-2,4

Nitrogen-2,5

Oxygen-2,6

Fluorine-2,7

Neon-2,8

Sodium-2,8,1

Magnesium-2,8,2

Aluminium-2,8,3

Silicon-2,8,4

Phosphorus-2,8,5

Sulphur-2,8,6

Chlorine-2,8,7

Argon-2,8,8

Potassium- 2,8,8,1

Calcium- 2,8,8,2

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