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