Question

An element A decays into an element C by a two step process
A ➝ B + 2He⁴ and B ➝ C + 2e- . Then,
(a) A and C are isotopes
(b) A and C are isobars
(c) B and C are isotopes
(d) A and B are isobars

Answer 1

Answer:

Isobars are atoms with same mass number but different atomic number.

Let atomic number of A be Z

Let mass number of A be X

A⟶

2

He

4

+B

Therefore, Atomic number of B will be Z−2

Mass number of B will be Z−4

B⟶2(

−1

e

0

)+C

Therefore, Atomic number of C will be Z

Mass number of C will be Z−4

It can be seen that B and C have same mass number but different atomic number. Hence, B and C are isobars.