Alexander Ake week 6 vocab

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Across
  1. 2. the total number of protons and neutrons in a nucleus.
  2. 7. a substance that cannot be separated or broken down into simpler substances by chemical means
  3. 9. the number of protons in the nucleus of an atom;
  4. 10. a subatomic particle that has a negative charge
Down
  1. 1. an arrangement of the elements in order of their atomic numbers such that elements with similar properties fall in the same column, or group
  2. 3. a subatomic particle that has a positive charge and that is located in the nucleus of an atom
  3. 4. a subatomic particle that has no charge and that is located in the nucleus of an atom
  4. 5. is a horizontal row of the periodic table.
  5. 6. the smallest unit of a element.
  6. 8. in chemistry, a column in the periodic table of the chemical elements.