Atoms, Elements & Compounds

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Across
  1. 3. You can fit ____ electrons in the first shell
  2. 10. Air is a ______ because there are different molecules and compounds NOT bonded together
  3. 11. A number that tells you how many protons (or electrons) are in an atom
  4. 12. The relative ____ of a proton is +1
  5. 13. A property of metals which means they can be shaped when hit
  6. 14. A property of metals that means they ring when hit
  7. 15. When two or more atoms of DIFFERENT elements are bonded, it forms a _____
  8. 16. The compound with the symbol MgO
  9. 17. When two or more atoms are bonded together, it forms a ______
  10. 18. You can fit ____ electrons in the 2nd shell
  11. 20. A group that contains sulphur and oxygen
  12. 22. The charge of a neutron is ______
  13. 23. A number that tells you how many protons and neutrons there are
  14. 24. The scientist who formulated the periodic table
Down
  1. 1. A different version of the same element with the same number of protons but a different number of neutrons
  2. 2. The compound with the symbol HCl
  3. 3. Metals are good ____ _______ which means thermal energy passes through them easily
  4. 4. The compound with the symbol FeO
  5. 5. Element with the symbol Mg
  6. 6. Where the protons and neutrons are found
  7. 7. Element with the symbol Na
  8. 8. A subatomic particles that is positive
  9. 9. A group that contains carbon and oxygen
  10. 19. When chlorine reacts with a metal, its name changes to
  11. 21. A subatomic particle with a negative charge