Periodic Table

1234567891011121314151617181920
Across
  1. 3. atoms that have the same number of protons and electrons but different numbers of neutrons and therefore have different physical properties
  2. 7. negatively charged particle
  3. 9. elements found in Group 1A of the periodic table
  4. 10. column of elements in the periodic table
  5. 12. elements found in Group 8A of the periodic table
  6. 14. positively charged particle
  7. 15. alkali metal that belongs to the sixth period
  8. 18. nonmetals form into these type of ions
  9. 20. row of elements in the periodic table
Down
  1. 1. who first published the classification of the elements in the periodic table
  2. 2. number of protons in the nucleus of an atom
  3. 4. elements found in Group 2A of the periodic table
  4. 5. A substance with high electrical conductivity, luster, and malleability, which readily loses electrons to form positive ions
  5. 6. neutrally charged particle
  6. 8. metals form into these type of ions
  7. 11. elements found in Group 7A of the periodic table
  8. 13. poor conductors of heat and electricity, and are not malleable or ductile
  9. 16. atom or molecule with net electric charge due to the loss or gain of electrons
  10. 17. average mass of the elements isotopes
  11. 19. positively charged region at the center of the atom