Across
- 2. It can hold up to 2 electrons
- 5. It contains atoms of more than one element
- 9. Number of protons in atoms of an element
- 10. Electrons in the same orbital have opposite ones
- 11. Negative subatomic particle
- 12. Number, protons plus neutrons
Down
- 1. A positive subatomic particle
- 3. They can be found in the periodic table
- 4. A charged particle
- 6. Anions and electrons are ...
- 7. Smallest possible particle of an element
- 8. Table that shows the elements
- 10. Different levels of energy