MS - PHS - Review 1

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Across
  1. 6. number of protons and neutrons in an atom
  2. 10. positive charged subatomic particle
  3. 11. added or taken away during a phase change
  4. 12. type of change where bonds break and new form
  5. 13. number of electrons the first energy shell holds
  6. 15. stuff(atoms) an object is made of
Down
  1. 1. mass per unit volume of a substance
  2. 2. vertical columns of the periodic table
  3. 3. electrons in the outer shell of atom
  4. 4. bond formed by atoms sharing electrons
  5. 5. phase of matter with no fixed volume or shape
  6. 7. compound from one or more elements sharing e-
  7. 8. bond formed between atoms by gaining or losing e-
  8. 9. horizontal rows of the periodic table
  9. 14. ability to be hammered into thin sheets