Question

(a) State three features of the nuclear model of an atom put forward by Rutherford.

(b) An atom has atomic number 12, Write the name of the element and its valency.

Answer 1

(a) Three features of the nuclear model of an atom put forward by Rutherford are:-

• There is a positively charged centre in an atom called the nucleus. Nearly, all the mass of an atom resides in the nucleus.
• The electrons revolve around the nucleus in well-defined orbits.
• The size of the nucleus is very small as compared to the size of the atom.

(b) Atomic number = 12

Protons = Electrons = 12

Electronic Configuration= 2,8,2

Valency = 2

This element is Magnesium.