environmental science

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Across
  1. 4. a substance composed of atoms that cannot beperiodicown
  2. 6. measurement of the amount of matter an object contains
  3. 8. a weak chemical bond that forms when hydrogen atoms are covalently bonded
  4. 12. attraction between two ions with opposite charges
  5. 14. chart of all chemical elements known
  6. 16. number of protons in the nucleus
  7. 17. atoms of the same element with different number of neutrons
  8. 18. very small particle that can contain chemical properties
Down
  1. 1. cohesion of water molecules at the surfacecapillaryof water
  2. 2. compounds used to hold together
  3. 3. anything that occupies space and has mass
  4. 5. unstable isotopes>radioactive isotopes
  5. 7. molecules containing more than one element
  6. 9. total number of protons and neutrons in an element
  7. 10. when adhesion of water moecules to a surface is stronger than cohesion between the molecules.
  8. 11. particles containing more than one atom
  9. 13. one side more positive, other side more negative
  10. 15. time it takes for atoms to decay