Provide the following information: $(4.2,4.4)$
a. the atomic number and symbol of the heaviest metalloid in Group $4 \mathrm{~A}(14)$
b. the atomic number and symbol of the element in Group $5 \mathrm{~A}$
(15), Period 6
c. the atomic mass and symbol of the alkali metal in Period 4
d. the metalloid in Group $3 \mathrm{~A}(13)$