Question

what elements make up a water molecule?
a two atoms of hydrogen and two atoms of oxygen
b one atom of hydrogen and two atoms of oxygen
c two atoms of hydrogen and one atom of oxygen

Explanation:

A water molecule has the chemical formula \(H_2O\), which means it consists of 2 hydrogen atoms and 1 oxygen atom. Option a has 2 H and 2 O, option b has 1 H and 2 O, both incorrect. Option c matches the formula.

Answer:

c. two atoms of hydrogen and one atom of oxygen