Chemistry in Biology

123456789101112131415161718
Across
  1. 2. A compound n which the atoms are held together by covalent bonds.
  2. 3. __________ Isotopes are broken down by radiation when the nucleus of an atom breaks up
  3. 6. Neutrons and Protons are located in the __________
  4. 7. Part of the atom located on the outside of the nucleus
  5. 8. Are the process by which atoms or groups of atoms in substances are reorganized into different substances
  6. 10. A pure substance that cannot be broken down by physical means
  7. 11. The beginning portion of a chemical reaction
  8. 14. Atoms of the same element that have the same number of protons and electrons but have a different number of neutrons
  9. 15. Carbon ____________ happens when nitrogen becomes carbon through beta decay
  10. 17. The positively charged part of an atom
  11. 18. ________ bonds occur when electrons are shared
Down
  1. 1. The neutral part of an atom
  2. 4. The study of matter
  3. 5. ____________ bonds occur when electrons are shared
  4. 9. ____________ = Atoms
  5. 12. The building blocks of matter
  6. 13. The result of a chemical reaction
  7. 16. __________-12 is used to date substances that have once been alive