Question

a molecule of oxygen gas (o2) is __________. *
nonpolar covalent bond
polar covalent bond
ionic bond
an atom

sodium (na) is a ________ *
alkalai metal
nonmetal
noble gas
metalloid

Explanation:

1. In an oxygen gas ($O_2$) molecule, two oxygen atoms share electrons equally as they have the same electronegativity. This results in a non - polar covalent bond.
2. Sodium (Na) is located in Group 1 of the periodic table. Elements in Group 1 are alkali metals.

Answer:

1. nonpolar covalent bond
2. alkali metal