Question

In which period decrease of atomic radii is very prominence?

Answer 1

In period 2, as the atomic number increases, the atomic radius of the elements decreases. Thus, the electronegativity increases and the ionization energy increases.

Answer 2

Second period decrease of atomic radii is very prominence

Because: for all elements in period 2, as the atomic number increases, the atomic radius of the elements decreases, the electronegativity increases, and the ionization energy increases.