Atoms definitions

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Across
  1. 3. Basic substance made of atoms that can't be separated
  2. 4. The sixth element, it is a non-metal and is relatively reactive.
  3. 7. Basic unit of a chemical element.
  4. 8. Element with metallic properties.
  5. 11. Mass of an atom.
  6. 12. Stable subatomic particle in nuclei, and has a positive charge
Down
  1. 1. First element on the periodic table, and the most abundant element.
  2. 2. Stable subatomic particle revolving around nuclei, and has a negative charge.
  3. 5. Element that lacks metallic properties
  4. 6. Number of an element on the periodic table.
  5. 9. table of elements arranged via atomic number.
  6. 10. Stable subatomic particle in nuclei, and has a neutral charge.