Chemistry

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Across
  1. 2. cloud A group of electrons circulating around a nucleus or a molecule
  2. 4. symbol a letter or pair of letters used to represent a chemical element
  3. 6. Atoms with the same number of protons but different numbers of neutrons
  4. 7. a subatomic particle of about the same mass as a proton but without an electric charge
  5. 8. particles the particles found inside an atom and are responsible for forming the structure of an atom
  6. 10. a subatomic particle with a positive electrical charge
Down
  1. 1. mass unit a unit for expressing masses of atoms, molecules, or subatomic particles
  2. 3. spherical structure found in the cell's nucleus whose primary function is to produce and assemble the cell's ribosomes
  3. 5. stable subatomic particle with a charge of negative electricity
  4. 9. numbers equal to the number of protons in the nucleus of an atom or the number of electrons in an electrically neutral atom