Question

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.

Options

• Both A and R are true, and R is the correct explanation of A.

• Both A and R are true, but R is not the correct explanation of A.

• A is true, but R is false.

• A is false, but R is true.

Answer 1

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

Explanation:

• Assertion (A) is true: The discovery of electrons, protons and neutrons helped scientists understand the internal structure of an atom.
• Reason (R) is true: In a neutral atom, the number of electrons is equal to the number of protons.

However, the equality of electrons and protons explains the electrical neutrality of an atom, not how the discovery of subatomic particles helped in understanding atomic structure.