(A) The electronic configuration of the metal ion $X^{3+}$ is $[Ar]3d^4$.This means the ion has $18$ (from $[Ar]$) $+ 4 = 22$ electrons.Since the ion

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

(A) The electronic configuration of the metal ion $X^{3+}$ is $[Ar]3d^4$.This means the ion has $18$ (from $[Ar]$) $+ 4 = 22$ electrons.Since the ion is formed by the loss of $3$ electrons from the neutral atom $X$,the number of electrons in the neutral atom is $22 + 3 = 25$.Therefore,the atomic number $Z$ of the transition metal $X$ is $25$.