Question

Which from following statements is NOT true about isotopes?

• A. These are the atoms of same elements.
• B. They have same chemical properties.
• C. They occupy same position in the modern periodic table.
• D. They have equal number of neutrons.

Hint:

Isotopes differ in the number of neutrons but have the same number of protons and occupy the same position in the periodic table.

Answer 1

The Correct Option is D

Step 1: Understanding the Question:
We need to identify the incorrect statement regarding isotopes.
Step 2: Detailed Explanation:
Isotopes are atoms of the same element (same atomic number \( Z \)) that have different mass numbers (\( A \)).
- Since \( Z \) is the same, they are atoms of the same element and have same electronic configuration (same chemical properties).
- Since the modern periodic table is based on \( Z \), they occupy the same position.
- Mass number \( A = \text{protons} + \text{neutrons} \). Different \( A \) for the same \( Z \) means they must have different numbers of neutrons.
Step 3: Final Answer:
Statement (D) is false; isotopes have a different number of neutrons.