homework guide

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Across
  1. 2. Elements in family 17.
  2. 4. A positively charged particle. (+ electrical charge)
  3. 6. A letter used to abbreviate the name of a set of atoms or an element.
  4. 8. A neutrally charged particle. (0 electrical charge)
  5. 9. The measurement for Atomic Mass
  6. 10. Elements in family 18.
Down
  1. 1. The number of protons found in an atoms nucleus.
  2. 3. The positively charged center of an atom that contains protons and neutrons.
  3. 5. The combined number of protons and neutrons found in the nucleus.
  4. 7. A negatively charged particle. (- electrical charge)