Example 7 Lithium 14 Nitrogen 12 Mg 24 Magnesium 16 oxygen 4

Example: 7 Lithium 14 Nitrogen 12 Mg 24 Magnesium 16 oxygen 4 Be 9 Beryllium 9 F 19 Fluorine 1 H 1 Hydrogen 2 He 4 Helium 11 Na 23 Sodium

Solution

Ans.) Atomic number is the number of protons in the nucleus of an atom whereas mass number is the sum of the total number of neutron and proton.

Lithium = Neutron 4, Proton- 3

Oxygen = Neutron 8, Proton- 8

Hydrogen = Neutron 0, Proton +1

Nitrogen = Neutron 7, Proton 7

Beryllium = Neutron 5, Proton- 4

Helium = Neutron 2, Proton- 2

Magnesium = Neutron12, Proton 12

Fluorine = Neutron 10, Proton 9

Sodium = Neutron 12, Proton 11