Biology Vocab

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Across
  1. 3. The sticking together of two same substance particles
  2. 5. Group of atoms bonded together
  3. 6. bond Unstable atoms are made stable once the two share electrons
  4. 9. Chemical substance composed of different elements held together by bonds
  5. 10. bond Attraction between atoms with opposite charges
  6. 11. Chemical substance that cannot be broken down
Down
  1. 1. Variety of an element with different numbers of neutrons
  2. 2. Bond Attraction between a proton in one molecule and an electronegative atom in the other
  3. 4. Negative particle in surrounding the nucleus
  4. 7. The clinging of two different substances
  5. 8. Center of an atom where the protons and neutrons are located
  6. 10. An atom with electrical charge due to the gain or loss of electrons