Chemistry Chpt 2

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Across
  1. 2. The electrons in the outer shell are called _______ electrons.
  2. 9. An atom with an unusual number of neutrons.
  3. 11. Atoms have an electrical ________ .
  4. 12. This is formed when two or more atoms combine
  5. 14. Positively charged particle in an atoms.
  6. 15. This is formed when two or more different atoms combine
  7. 16. Man-made
  8. 18. The center of an atom.
Down
  1. 1. The old word for one who experimented with chemicals.
  2. 3. Neutrally charged particle in an atom.
  3. 4. The smallest particle of an element that still keeps the properties of that element.
  4. 5. Negatively charged particle in an atoms.
  5. 6. A happy atom is an atom with a full outer _____ .
  6. 7. Atoms that lose or gain electrons are called _____ .
  7. 8. The _______ Table of Elements.
  8. 10. Another name for electron shell is ______ level.
  9. 13. The third name for energy levels or electron shells.
  10. 17. Atoms can gain or lose electrons: True or False
  11. 18. The number of naturally occurring elements found on the Earth.