Question

An element in +3 oxidation state has the electronic configuration (Ar) $3d^3$. Its atomic number is

• A. 24
• B. 23
• C. 22
• D. 21

Answer 1

Answer: (A)

$M^{3+}:[Ar{]}^{18}3d^3$
$\therefore$ At. no. of M = 18 + 3 + 3 = 24