Question

An atom has mass number of 238 and atomic number of 92 and atom B
has mass number 235 and atomic number 92
a) How many protons in A & B atoms
b) How many neutrons in A & B atoms
c) Are A and B isotopes or isobars Explain

Answer 1

Answer:

When

92

238

U emits a α-particle then the atomic number is decreased by two units and mass number is decreased by four-unit.

92

238

U⟶

90

234

Th+

2

4

He

Hence, the correct option is C

Answer 2

Answer:

option c is your correct answer