why is the atomic radius of calcium(0.197nm) larger than that of iron(0.116nm)?

[22shimmer22girly]

please help...

 

[DarkEclipse]

Iron [Ar] 3d6 4s2
Calcium [Ar] 4s2

Iron has an extra d subshell, whereas Calcium does not. Therefore, Iron's nucleus attracts the electrons towards itself, which results in the outer shell being closer to the nucleus. Therefore, Calcium has a higher atomic radius than Iron.

 

[22shimmer22girly]

Iron [Ar] 3d6 4s2
Calcium [Ar] 4s2

Iron has an extra d subshell, whereas Calcium does not. Therefore, Iron's nucleus attracts the electrons towards itself, which results in the outer shell being closer to the nucleus. Therefore, Calcium has a higher atomic radius than Iron.

thank uuu sooo muchhh