Nature of Matter

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Across
  1. 2. positive chreged particles inside the nucleus
  2. 5. substance formed by the chemical combination of two or more elements in definite proportions
  3. 6. negatively charged particle; constantly moving around the nucleus
  4. 8. one of several forms of a single element, which contains the same number of protons but different numbers of neutrons
Down
  1. 1. thebasicunit of matter
  2. 3. the center of an atom
  3. 4. neutralcharged particles inside the nucleus
  4. 7. pure substance that consists entirely of one type of atom