Across
- 3. Group 1 of the periodic table are __________ because of their valence electrons.
- 4. The second, third, and fourth shells can hold a max of how many electrons?
- 8. The smallest unit of an element
- 10. No charge, Fixed in the nucleus.
- 11. Contains only one type of atom
- 12. When your hair sticks to a balloon, it is an example of _____ electricity
- 13. The first shell can only hold how many electrons?
- 14. Group 18 have a full outer shell, and are ____- Reactive
Down
- 1. Scientists need this to build on from existing ideas.
- 2. Positively charged, Fixed in the nucleus
- 5. An atom or groups of atoms with a charge
- 6. Electrons on the outer shell as also known as _____ electrons
- 7. Negatively charged
- 9. Protons and Neutrons make up the _____ of the atom.