Unit 3 Vocabulary

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Across
  1. 2. vertical column on the periodic table
  2. 3. another name for light quanta
  3. 4. sum of protons and neutrons in the nucleus of an atom
  4. 8. the smallest part of matter that retains the properties of that matter
  5. 9. horizontal row on the periodic table
  6. 11. atoms of the same element having different numbers of neutrons
  7. 12. abbreviation for the unit of mass used for describing atoms
  8. 13. distance between two peaks of a wave
  9. 15. a particle with no charge in the nucleus of an atom
  10. 16. number of waves that pass a given point per second
Down
  1. 1. a positively charged particle in the nucleus of an atom
  2. 5. the mass of a single atom measured in atomic mass units
  3. 6. a negatively charged particle in the nucleus of an atom
  4. 7. electron in the outermost energy shell of an atom
  5. 10. central part of the atom, responsible for the atom's mass
  6. 14. the number of protons in the nucleus of an atom