Matter

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Across
  1. 2. an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
  2. 3. a part or aspect of something abstract
  3. 5. the number of protons in the nucleus of an atom
  4. 7. a subatomic particle of about the same mass as a proton but without an electric charge
Down
  1. 1. physical substance in general
  2. 2. each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
  3. 4. a stable subatomic particle with a charge of negative electricity
  4. 6. the total number of protons and neutrons in a nucleus.