Question

Assertion: Calcium and Argon are two examples of Isobars. Reason: Isobars are elements with same mass number but different atomic number.
i) Both A and R are true and R is correct explanation of the assertion.
ii) Both A and R are true but R is not the correct explanation of the assertion.
iii) A is true but R is false.
iv) A is false but R is true.

Answer 1

Answer:

Both the elements have same atomic mass equal to 40 but different atomic numbers, i.e. argon has atomic number equal to 18 and calcium has atomic number equal to 20

Answer 2

Both the provided statements are true and the second statement is the right explanation of first one. So, the option 1 is true.

To find the reason for this we must first need to understand what are isobars.

Isobars

• The elements which bears the same atomic mass but their atomic number is different.
• Same mass number describes the same number of nucleons present in the element which means number of neutrons and protons.

Both Argon and Calcium are isobars and the reason being that  they are having same atomic mass of 40 and their atomic number is different i.e. 18 and 20 respectively.