Matter crossword

3. how many atoms are in the air we breathe?
5. atoms and molecules join together into a solid, ______, or gas
6. H2O is the _______ symbol for water
8. how many atoms are in one molecule of water?
10. what type of matter is it when the molecules are joined closely together?
11. ______ join together to make molecules
13. there are two atoms of _____ in water.

1. smallest piece of substance that has all the properties of the substance
2. iron consists of a ______ atom and is not a compound or molecule
3. NaCl is the molecular formula for ______
4. a water molecule is the smallest _____ of water that still has all the properties
7. different atoms come together to form ____
9. atoms, molecules, and compounds are the ___ blocks of all matter
11. join together to make molecules
12. anything that has mass and takes up space