Biology biochemistry

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Across
  1. 4. The basic unit of matter
  2. 5. When an electron is gained or lost
  3. 6. negative charge
  4. 7. Have a different amount of neutrons in the nucleus
  5. 10. make up half the nucleus
  6. 12. When two elements share an electron unequally
  7. 14. when two elements share an atom equally
Down
  1. 1. When two atoms share an electron
  2. 2. made up of two elements
  3. 3. When two of the same element sticks to eachother
  4. 8. Pure substance
  5. 9. Has a positive charge
  6. 11. when atoms lose or gain an atom a(n) ___ is formed
  7. 12. When two elements are shared between
  8. 13. When two different elements stick to each other