Chemistry

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Across
  1. 2. vertical columns that show how many outer electrons each atom has
  2. 4. The softest element in Group 1
  3. 6. The most reactive element in Group VII
  4. 7. Transition metals have _____ densities
  5. 10. in the Periodic table
  6. 12. number of protons + number of neutrons
  7. 14. horizontal rows that show the number of shells of electrons an atom has
  8. 15. All substances are made of tiny particles of matter called _____.
  9. 17. The most stable elements in the Periodic table
Down
  1. 1. Reactivity of Group VII elements ______ going down the group.
  2. 3. The protons and neutrons are located at the centre of the atom
  3. 5. The lightest noble gas.
  4. 8. Reactivity of Group 1 elements ______ going down the group.
  5. 9. Another name for Group VII elements
  6. 11. Group 1 element with the smallest atomic number
  7. 13. Group 1 and 2 elements are _________. (metal, nonmetal, metalloid)
  8. 16. Chlorine is a gas at room temperature