Answer to Question #162355 in General Chemistry for Debbie o'donnell

Question

from the third Period name an element which is a) solid non-metal and trivalent with formula. b) solid non-metal and divalent with formula c) a gas which is mono-atomic.

Answer 1

a) solid non-metal and trivalent with formula. Phosphorus (P)

b) solid non-metal and divalent with formula - Chlorine (Cl)

c) a gas which is mono-atomic-Argon (Ar)

The third period contains eight elements: sodium, magnesium, aluminium, silicon, phosphorus, sulfur, chlorine, and argon.

Monoatomic (monatomic): A molecule composed of just one atom, and lacking any covalent bonds. The noble gases (He, Ne, Ar, Kr, Xe, and Rn) are all monoatomic, whereas most other gases are at least diatomic.

Note:

-Requirement is third period