Science Crossword Puzzle

12345678910
Across
  1. 3. forms between metal atoms when their outermost energy levals overlap
  2. 4. group of atoms held together by chemical bonds
  3. 7. poor conductors of heat and electricity
  4. 9. positively or negatively charged particle
  5. 10. forms when atoms share one or more pairs of electrons
Down
  1. 1. abbreviation for an elements name
  2. 2. positively charged particle found in a nucleus
  3. 5. negatively charged subatomic particle
  4. 6. force that brings oppositely charged ions together
  5. 8. outermost level of electrons