Identify the element for which electronic configuration in + 3...

${Fe 26}^{3 +} = 3{d}^{5}4{s}^{0}$

$27{Co}^{3 +} = 3{d}^{6}4{s}^{0}$

${Cr 24}^{3 +} = 3{d}^{3}4{s}^{0}$

$25{Mn}^{3 +} = 3{d}^{4}4{s}^{0}$

${M}^{+ 3} = [ 18Ar ] 3{d}^{5}4{s}^{0}$

$M = \left[Ar 18\right]3{d}^{6}4{s}^{2}$

so $Z$ for $M = 26$ and $M$ is $Fe .$