Atoms and elements

Edit Answers
12345678910111213141516
Across
  1. 4. The central part of the atom
  2. 5. Positively charged sub-atomic particle
  3. 7. Formed when a liquid evaporates
  4. 9. Substance made up of only one type of atom
  5. 12. Noble gas with a relative atomic mass of 40
  6. 13. Least reactive metal in group 1
  7. 14. A list of elements in order of how much they react is called the _________ series
  8. 16. Neutral sub-atomic particle found in the nucleus
Down
  1. 1. Rows on the periodic table
  2. 2. Type of reaction where the more reactive element takes the place of the less reactive element in the compound
  3. 3. Type of element found on the left of the periodic table
  4. 6. Metal with 12 electrons
  5. 8. Element in group 2, period 5
  6. 10. Metal with 29 protons
  7. 11. Negatively charged sub-atomic particle found in shells
  8. 15. Smallest particle of an element that can exist