Across
- 2. a particle that is smaller than an atom in size, or a cluster of such.
- 7. the temperature at which a given solid will melt.
- 9. electrons in the outermost shell, or energy level, of an atom.
- 10. the time taken for the radioactivity of a specified isotope to fall to half its original value.
- 11. change in the position of an object.
- 12. the complete transfer of valence electron(s) between atoms.
Down
- 1. The sum of the atomic masses of all atoms in a molecule
- 3. temperature at which the pressure exerted by the surroundings upon a liquid is equaled by the pressure exerted by the vapor of the liquid
- 4. the mutual sharing of one or more pairs of electrons between two atoms.
- 5. Carbon compounds are those whose molecules contain a carbon atom.
- 6. Atoms with the same number of protons but different numbers of neutron
- 7. is the SI unit of the amount of substance.
- 8. a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.