Matter

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