Question

Assertion (A): Calcium and Argon are two examples of Isobars.
Reason (R): Isobars are elements with same mass number but different atomic number
a) Both A and R are true and R is the correct explanation of the assertion.
b) Both A and Rare true but R is not the correct explanation of the assertion.
c) A is true but R is false.
d) A is false but R is true​

Answer 1

The correct option is a.

• Isobars are defined as the elements which have the same mass number but different atomic numbers. Thus the reason is true.
• The mass number of Ca is 40 and the mass number of Argon is 40. The atomic number of Ca is 20 but the atomic number of Ar is 18.
• So, Ca and Ar has different atomic number but same mass number so, they are isobars.
• Hence both A and R are true and R is the correct explanation of the assertion.

Answer 2

Answer:Option A

Explanation: