periodic table

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Across
  1. 3. The total number of protons and neutrons in an atomic nucleus
  2. 5. An ordered arrangement of the chemical elements into rows or periods and columns
  3. 8. An abbreviation for a chemical element
Down
  1. 1. The atomic number of protons in the nucleus of an atom.
  2. 2. Property of an element that you use your senses to observe
  3. 4. A pure substance that cannot be broken down into a simpler chemical substance by any physical or chemical means
  4. 6. Charged particles that has an UNEVEN number of protons and electrons.
  5. 7. The area surrounding the nucleus of an atom where the number of protons are most likely to be found