Periodic Table Crossword

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Across
  1. 2. The number of protons in an atom's nucleus is __________ to its atomic number.
  2. 3. Matter made up of one kind of atom.
  3. 7. Positively charged subatomic particles.
  4. 9. Negatively charged subatomic particles.
  5. 11. Any of the six chemical elements that make up Group 1 of the periodic table.
  6. 14. The electrons on the outer orbital.
  7. 17. Subatomic particles with no charge.
  8. 19. An element whose properties are intermediate between those of metals and nonmetals.
  9. 20. Atoms of the same element that have a different number of neutrons.
Down
  1. 1. Bond between nonmetals.
  2. 4. Anything that has a mass and takes up space.
  3. 5. Elements that are dull, brittle, and often a gas at room temperature.
  4. 6. A small nucleus positively charged surrounded by negative electrons moving around the nucleus in orbits.
  5. 8. Bond between a metal and nonmetal.
  6. 10. Chemical element that forms a salt when it reacts with metal.
  7. 12. An atom with a charge.
  8. 13. Elements that are shiny, good conductors, and found on the left on the Periodic Table.
  9. 15. The smallest particle of an element that retains the element's properties.
  10. 16. Columns (up/down) on the Periodic Table.
  11. 18. Rows (across) on the Periodic Table.