Effective magnetic moment of $Sc^{3+}$ ion is

Which of the following pairs will have the same effective magnetic moment?

The number of valence electrons in $Fe^{2+}$ ion $(Fe = 26)$ is .......

Which of the following electronic configurations is associated with the highest stable oxidation state?

Which of the following series of elements has approximately the same atomic radius?

Explain the variations in atomic radii of transition elements along the period. The following table provides data for the first transition series:

Element	Sc	Ti	$V$	Cr	Mn	Fe	Co	Ni	Cu	Zn
Metallic Radius $M$ (pm)	$164$	$147$	$135$	$129$	$137$	$126$	$125$	$125$	$128$	$137$