Across
- 4. The horizontal numbers on a periodic table which tell the amount of valence electrons
- 7. The amount of matter in a substance
- 9. A substance that consists of atoms that all have the same number of protons
- 10. A solid with high density and good conductivity
- 11. Has a mass of 1 amu, also has a neutral charge
Down
- 1. Held in the electron cloud, has a negative charge
- 2. Something of any state of matter, and is a poor conducter
- 3. The ability to react with other elements
- 5. A solid which is a semi conducter
- 6. A substance composed of two or more elements
- 8. Used to identify an atom and has a positive charge, has a mass of 1 amu