Atomic Structure Unit Vocab

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Across
  1. 3. A subatomic particle that has no charge and that is found in the nucleus of an atom
  2. 6. Atoms of the same element that have different numbers of neutrons
  3. 10. A subatomic particle that has a positive charge and that is found in the nucleus of an atom
  4. 11. the sum of the number of neutrons and protons in an atomic nucleus
  5. 12. Horizontal rows on the periodic table
Down
  1. 1. the weighted average of the atomic masses of the naturally occurring isotopes of an element
  2. 2. Electrons on the outermost energy level of an atom
  3. 4. the number of protons in the nucleus of an atom
  4. 5. particles of matter that make up protons and neutrons
  5. 7. Vertical columns on the periodic table
  6. 8. Basic unit of matter; Smallest particle of an element
  7. 9. A subatomic particle that has a negative charge