Atoms, Elements & Compounds

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Across
  1. 3. Neils ______: scientist who stated that electrons move around the nucleus in orbits
  2. 5. The element with the chemical symbol S
  3. 6. ___________ number - number of protons
  4. 11. The smallest part of an element
  5. 12. Positively charged subatomic particle
  6. 15. Negatively charged subatomic particle
  7. 16. _________ number - number of protons and electrons
  8. 18. The part of the atom the contains the protons and neutrons
Down
  1. 1. Two or more different substances mingled together but not chemically combined
  2. 2. The number of electrons that the first shell can hold
  3. 4. The element with the chemical symbol He
  4. 6. _____________ metals - group 1 on the periodic table
  5. 7. A substance that is made up of two or more different elements chemically combined
  6. 8. A substance that cannot be broken down into simpler substance by chemical means
  7. 9. The element with the chemical symbol Au
  8. 10. The element with the electronic configuration of 2, 8, 8, 1
  9. 13. The element that has 8 protons and electrons
  10. 14. __________ gases - all elements in this group have a full outer shell
  11. 17. The elements that has an atomic number of 11