C. Ag, Au and Cu are called coinage metals.
Metalloids are border of metals and non metals
d. group b i element are very active nonmetals

what's the

"hydrogen bonding is the attraction of h atoms in the water molecule (slight + charge) to o atoms in a neighboring water molecule (slight - charge); it is a weak interatomic force. but it is still strong enough to the water molecules "stick" together."

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).