Question

Atomic number and mass number of an element M are 25 and 52 respectively. The number of electrons, protons and neutrons in M⁺² ion are respectively.

• A. 25, 25 and 27
• B. 25, 27 and 25
• C. 27, 25 and 27
• D. 23, 25 and 27

Answer 1

Answer: (B)

25, 27 and 25

Answer 2

${}_{25}^{52}M^{2 +}$; z = 25 = P, e = 25 – 2 = 23

A = 52

n = A – Z = 52 – 25 = 27