Assertion(A): All isotopes of a given element show the same type of chemical behaviour.
Reason(R) The chemical properties of an atom are controlled by the number of electrons in the atom.

Options

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. Both A and R are false.

Explanation

To solve the assertion-reason question, we will analyze both the assertion (A) and the reason (R) step by step.

### Step 1: Understand the Assertion
**Assertion (A):** All isotopes of a given element show the same type of chemical behavior.

- **Explanation:** Isotopes are variants of the same element that have the same atomic number (number of protons) but different mass numbers (number of neutrons). For example, carbon has isotopes like Carbon-12 and Carbon-14. Despite having different masses, they are still carbon and behave chemically in the same way.

### Step 2: Understand the Reason
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