Assertion (A): The discovery of subatomic particles helped in understanding the atomic structure.

Reason (R): The number of electrons is equal to the number of protons in an atom.

Choose the correct option:

(a) Both (A) and (R) are true, and (R) is the correct explanation of (A).

(b) Both (A) and (R) are true, but (R) is not the correct explanation of (A).

(c) (A) is true but (R) is false.

(d) (A) is false but (R) is true.

(b) Both (A) and (R) are true, but (R) is not the correct explanation of (A).

Explanation: The discovery of subatomic particles like electrons, protons and neutrons helped scientists understand that atoms are divisible and contain smaller particles inside them. This led to the development of different atomic models and a better understanding of atomic structure.

In a neutral atom, the number of electrons is equal to the number of protons, which makes the atom electrically neutral. Although both the statements are correct, they are unrelated.