Answer
(a) Group 18 contains no metals or metalloids.
(b) Group 13 contains only one metalloid.
(c) Group 14 contains only one nonmetal.
(d) Group 17 contains only nonmetals.
Work Step by Step
(a) Group 18, known as the noble gases, contains no metals or metalloids. All the elements in this group are gases at room temperature and have complete valence electron shells, making them highly stable and unreactive.
(b) Group 13 contains only one metalloid, which is boron (B), metals (aluminum - Al).
(c) Group 14 contains a nonmetal (carbon - C), metalloids (silicon - Si, Germanium - Ge), metals (Sn, Pb).
(d) Group 17 (the halogens), contains only nonmetals.
