Question

Which of the following are isobars?

${}_{18}^{40}Ar$, ${}_6^{14}C$, ${}_{20}^{40}Ca$, ${}_7^{14}N$

• A. [I, II] and [III, IV]
• B. [I, III] and [II, IV]
• C. [I, IV] and [II, III]
• D. None of these

Answer 1

The correct option is B

[I, III] and [II, IV]

Isobars are atoms of different elements which have the same mass number.

An element can be represented as

${}_{MassNumber}^{AtomicNumber}X$