Question

Electronic configuration of a transition element X in +3 oxidation state is $\lbrack Ar\rbrack 3d^{5}$ what is its atomic number?

• A. 25
• B. 26
• C. 27
• D. 24

Answer 1

Answer: (B)

26

Answer 2

The electronic configuration of $X^{3 +}$is $\lbrack Ar\rbrack 3d^{5}$

$\therefore$ Atomic no. of X = 18 + 5 + 3 = 26