Which of the following are likely to form a covalent bond?
two gold atoms
o two neon atoms
• hydrogen and oxygen ·atoms
magnesium and bromine atoms

• Hydrogen and oxygen atoms  

Explanation:

Hydrogen and oxygen are nonmetals. They are most likely to share electrons and form a covalent bond.

A is wrong. Gold is a metal, so it will form metallic bonds.

O is wrong. Neon is a noble gas. It has a complete octet, so it is unlikely to form covalent bonds.

D is wrong. Mg is a metal, and Br is a nonmetal. They are more likely to form ionic bonds.

14 days is the half-life of phosphorus-32