Answer:
atoms of hydrogen
Explanation:
The molecular formula for a water molecule is 
.
From the above formula, we can conclude that 1 molecule of water contains 2 atoms of hydrogen and 1 atom of oxygen.
There are 
molecules of water.
1 molecule of water = 2 atoms of hydrogen.
∴ molecules of water = 
atoms of hydrogen.
Therefore, there are atoms of hydrogen in molecules of water.
Matter<span> takes up space. You can put it in a container. While gases, liquids, and solids take up space, </span>light<span> and </span>heat<span> do </span>not<span>. Usually </span>matter<span> and energy are found together, so it can be tricky to distinguish between them. Hope this helps!!</span>
