Periodic Table

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Across
  1. 3. The number of protons plus neutrons
  2. 5. Property of an element that you use your senses to observe.
  3. 7. The number of protons in an atom
  4. 8. an atom or a group of atoms that has a positive or negative electrical charge due to the loss or gain of electrons
Down
  1. 1. a one- or two-letter abbreviation used to represent a chemical element
  2. 2. a one- or two-letter abbreviation used to represent a chemical element
  3. 4. a chart that arranges chemical elements into rows (periods) and columns (groups) based on their atomic number
  4. 6. The region where electrons are found in an atom