Chemistry revision

1234567891011121314
Across
  1. 3. Group 1 of the periodic table are __________ because of their valence electrons.
  2. 4. The second, third, and fourth shells can hold a max of how many electrons?
  3. 8. The smallest unit of an element
  4. 10. No charge, Fixed in the nucleus.
  5. 11. Contains only one type of atom
  6. 12. When your hair sticks to a balloon, it is an example of _____ electricity
  7. 13. The first shell can only hold how many electrons?
  8. 14. Group 18 have a full outer shell, and are ____- Reactive
Down
  1. 1. Scientists need this to build on from existing ideas.
  2. 2. Positively charged, Fixed in the nucleus
  3. 5. An atom or groups of atoms with a charge
  4. 6. Electrons on the outer shell as also known as _____ electrons
  5. 7. Negatively charged
  6. 9. Protons and Neutrons make up the _____ of the atom.