Across
- 2. a negatively charged subatomic particle
- 3. The number of these determines what type of element an atom is
- 4. The man who discovered electrons
- 6. This contains properties of both metals and non-metals
- 7. These weigh the same amount as protons
- 9. The abbreviation of the measurement to find how much an atom weighs
- 10. Elements in these show gradual changes in chemical properties
Down
- 1. This surrounds the nucleus
- 2. This type of model shows the number of valence electrons in an atom
- 5. This type of model shows all electrons in a given atom
- 6. "Who told the elements where to go?..."
- 8. An example of the is the Halogen _________