Chemistry

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Across
  1. 2. outside the nucleus and contain the electrons
  2. 4. it could lose 1 electron or gain 7 and are highly reactive
  3. 5. building block of matter
  4. 7. protons+Neutrons
  5. 10. subatonic particles with a neutral charge
  6. 11. a verticle column on the periodic table
  7. 12. russian chemist
  8. 13. a group of atoms held together held together by a covalent bonding that acts as an independent unit
  9. 14. small,very dense, has a positive charge, and has all the mass
  10. 16. a horizontal column on the periodic table
  11. 17. electrons in the outermost energy level
  12. 18. subatonic particles with a positive charge
Down
  1. 1. do not react
  2. 3. atoms of one type
  3. 4. number of protons and electrons
  4. 6. a chemical bond formed when two atoms share one or more pairs of valence electrons
  5. 8. a one or two letter abbreviation derived from the elementś English or Latin name
  6. 9. subatonic particles with a negative charge
  7. 10. Elements common name
  8. 15. protons,neutrons, and electrons