Chemistry Chapter 2

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Across
  1. 3. – A particle in the nucleus with no charge.
  2. 5. – A horizontal row in the periodic table.
  3. 7. NUMBER – Number of protons in an atom, defining the element.
  4. 8. GASES – Inert elements in Group 18.
  5. 9. MASS – Sum of protons and neutrons in an atom.
  6. 10. – Atoms of the same element with different numbers of neutrons.
Down
  1. 1. - Positively charged particle in an atom's nucleus.
  2. 2. – A vertical column in the periodic table.
  3. 4. – The dense central part of an atom containing protons and neutrons.
  4. 6. – Negatively charged particle orbiting the nucleus.