Across
- 4. a measure of the amount and type of matter in an object
- 7. a group of atoms bonded together
- 8. having the properties of an alkali, or containing alkali
- 10. to act on or change someone or something
- 12. a substance formed from two or more elements chemically united in fixed proportions
- 14. an atom or molecule with a net electric charge due to the loss or gain of one or more electrons
- 15. in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign
Down
- 1. a change in physical form or a nuclear reaction
- 2. the positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass
- 3. the mass of an atom of a chemical element expressed in atomic mass units
- 5. the charge number of an atomic nucleus
- 6. consisting of uncombined atoms rather than molecules
- 9. a substance that cannot be broken down into any other substance
- 11. a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
- 13. a molecule or other entity that can donate a proton or accept an electron pair in reactions.