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: Understand the concept of isotopes.
Isotopes are atoms of the same element that have the same number of protons but a different number of neutrons. This difference in neutrons gives them different atomic masses but they retain similar chemical properties.

Step 2: Analyze the statements.
- Option (1): Isotopes are atoms of the same element, so this statement is true.
- Option (2): Isotopes have the same chemical properties because they have the same number of electrons, which determines chemical behavior, so this statement is true.
- Option (3): Isotopes occupy the same position in the periodic table because they have the same number of protons, so this statement is true.
- Option (4): Isotopes have different numbers of neutrons. Therefore, the statement that they have equal numbers of neutrons is false.

Step 3: Final Answer.
Thus, the statement that is NOT true is option \((4)\).