Matter

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Across
  1. 5. substances that are made of only one type of atom or only one type of molecule
  2. 8. any change that results in the formation of new chemical substances.
  3. 9. the positively charged central core of an atom
  4. 10. with no net electric charge and a mass slightly larger than that of a proton
Down
  1. 1. the number of protons in the nucleus of an atom
  2. 2. physical substance in general
  3. 3. with a positive electric charge of +1e elementary charge and mass slightly less than that of a neutron.
  4. 4. the mass of an atom
  5. 6. each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter
  6. 7. changes affecting the form of a chemical substance, but not its chemical composition.