A transition metal X has a configuration [Ar] | vedclass

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(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

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$25$

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(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 $25$.

$A$ transition metal $X$ has a configuration $[Ar]3d^4$ in its $+3$ oxidation state. Its atomic number is

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