science

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Across
  1. 2. Vertical columns on the periodic table
  2. 5. Energy levels where electrons are found
  3. 10. How easily an element undergoes a chemical reaction
  4. 11. A negatively charged particle that orbits the nucleus
  5. 12. Horizontal rows on the periodic table
  6. 13. A pure substance made of only one type of atom
Down
  1. 1. The center of an atom containing protons and neutrons
  2. 3. Relating to atoms
  3. 4. A group of reactive metals found in Group 2 of the periodic table
  4. 6. The lightest element in the periodic table
  5. 7. The first metal in Group 1 of the periodic table
  6. 8. A neutral particle in the nucleus
  7. 9. A positively charged particle in the nucleus