Question

(a) Which of the following atoms or ions is diamagnetic?

Cr Br Mn2+ B C4+

(b) Which of the following atoms or ions is paramagnetic?

C4- S4+ V4+ Se2- Ge4+

(c) Which one of the following elements has a +2 ion with 1 unpaired electron?

Se Mg N V Fe

(d) Use periodic trends and predict which of the following elements has the smallest first ionization

energy.

Na F K P

(e) Use periodic trends and predict which of the following elements has the smallest atomic radius.

Ca Al B Rb

(f) Use periodic trends and predict which of the following ions has the smallest radius.

Mg2+ F- Na+ N3-

Answer 1

d) Ionization energy is the amount of energy required to remove an electron from isolated gaseous atom in it's ground state.

It depends upon the size of the atom. Large is the size more easily the electron will escape from it's nuclear charge.

Largest size out of all of these is K. Hence it will have the smallest first ionization enthalpy.