4. Which trends are observed as each of the elements within Group 1 on the Periodic
Table are considered in order from top to bottom?
(A) Their atomic radii decrease and their first ionization energies increase.
(B) Their atomic radii increase and their first ionization energies increase.
(C) Their atomic radii decrease and their first ionization energies decrease.
(D) Their atomic radii increase and their first ionization energies decrease.