# Which has the maximum magnetic moment

$(a)\;Mn^{2+}\qquad(b)\;Fe^{2+}\qquad(c)\;Ti^{2+}\qquad(d)\;Cr^{2+}$

$Mn^{2+}$ has five unpaired electron ($1s^2,2s^22p^6,3s^23p^6sd^5)$ and has maximum magnetic moment.
Hence (a) is the correct answer.