The atomic radius of gallium is less than that of aluminium why?

Explain why atomic radius of Ga is less than that of Al.

Why I_1 of Al is less than that of Mg?

(A): The atomic size of gallium is less than expected (R): In gallium the 3^(10) delectrons do not shield effectively

Why first ionisation potential of aluminium is less than that of magnesium?

What is electron affinity? Why the electron affinity of fluorine is less than that of chlorine?

What is electron affinity? Why the electron affinity of fluorine is less than that of chlorine?

Radius of cation is less than that of parental atom, but radius of anion is greater than that of parental atom. Explain.