2.1 Matter

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