atom period group proton neutron electron atomic number molecule compound element period table of elements

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Across
  1. 4. a group of atoms bonded together
  2. 7. a negative electrical charge
  3. 9. positively charged protocols
  4. 11. a chemical substance that combines two or more elements
Down
  1. 1. same mass as a proton
  2. 2. the number of protons in the nucleus of an atom
  3. 3. a aspect of something abstract
  4. 5. formation of molecules
  5. 6. process
  6. 8. table of elements its used in chemistry, physics, and other sciences
  7. 10. chemical element