Vocabulary 4

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Across
  1. 2. number of protons in the nucleus
  2. 3. vertical column of the periodic table
  3. 5. a table with an arrangement of elements
  4. 6. is the smallest particle of an element
  5. 7. horizontal row of the periodic table
  6. 9. an element is composed of only one kind of atom
  7. 13. same number of protons; different numbers of neutrons
Down
  1. 1. total number of protons and neutrons
  2. 2. abbreviation is amu
  3. 4. a.k.a glowing beam
  4. 5. positively charged
  5. 8. no charge
  6. 10. central core of an atom
  7. 11. weighted average mass of an atom
  8. 12. negatively charged