Across
- 2. A substance that cannot be broken down into simpler substances by chemical or physical means.
- 4. Is the total mass of the atom (protons plus neutrons) expressed in atomic mass unit.
- 5. Form when electrons are shared by metal ions.
- 7. The smallest particle of matter that contains the characteristics of an elements.
- 8. The force that hold atoms together in a compound.
- 10. An atom that has an electrical charge because of a gain or loss of one or more electrons.
- 11. Atoms with the same number of protons but different numbers of neutrons.
Down
- 1. The number of protons in the nucleus.
- 3. Electrons are located these regions.
- 6. Form when atoms share electrons.
- 8. A substance that consist of two or more elements that are chemically combined in specific proportions.
- 9. Form between positive and negative ions.