Question

A transition element $X$ has a configuration $\lbrack Ar\rbrack 3d^{4}$ in its + 3 oxidation state. Its atomic number is.

• A. 25
• B. 26
• C. 22
• D. 19

Answer 1

Answer: (A)

25

Answer 2

Number of electrons in excited state

$X^{+ 3} = 18 + 4 = 22$

Number of electrons in ground state

$X = 22 + 3 = 25$.