Atoms of which element combines with hydrogen to give water?

Oxygen

The correct answer is option 2. Oxygen.

Water is composed of two hydrogen atoms and one oxygen atom, and its chemical formula is H₂O. During the formation of water, hydrogen atoms combine with oxygen atoms. The process involves the sharing of electrons between hydrogen and oxygen to form covalent bonds.

The chemical equation for the formation of water is:

\[ 2 \text{H}_2 + \text{O}_2 \rightarrow 2 \text{H}_2\text{O} \]

In this equation, hydrogen gas (\( \text{H}_2 \)) combines with oxygen gas (\( \text{O}_2 \)) to produce water (\( \text{H}_2\text{O} \)). Each oxygen atom shares electrons with two hydrogen atoms, resulting in the formation of water molecules.

So, oxygen is the element that combines with hydrogen to give water.