Across
- 3. The smallest particle of an element that cannot be broken down without losing its properties; basic unit that makes up all matter.
- 4. The number of each molecule in a chemical formula.
- 6. A short simple way to describe a chemical reaction using symbols.
- 7. Simple model of an atom that shows the distribution of protons and neutrons in the nucleus and the distribution of electrons in orbiting energy levels.
- 8. The force that holds the atoms of molecules and compounds together.
- 10. The average mass of an atom.
Down
- 1. Breaks easily when placed under stress.
- 2. The number of protons found in the nucleus of an atom.
- 5. When chemical bonds are broken and atoms rearrange, a chemical reaction occurs.
- 6. Change in a substance through chemical reactions to form new substances with different properties.
- 9. A substance made up of two or more different types of atoms (elements).