8th grade science crossword puzzle

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Across
  1. 3. it means how likely an element is to undergo a chemical change
  2. 5. elements in a column are known as a
  3. 8. it is formed when an atom loses or gains one or more electrons
  4. 10. are negatively charged particles that move outside the nucleus
  5. 11. the elements to the right side of the periodic table are called
  6. 12. it is a positively charged particle
  7. 13. elements that conduct electric current and heat well and have a shiny appearace
Down
  1. 1. the combination of protons and neutron is called the
  2. 2. in the early 1900's the physicist merie curie named the process by which atoms produce energy and particles
  3. 4. an atom of the some element that have a different number of neutrons
  4. 6. each horizontal row in the periodic table is called a
  5. 7. have properties of both metals of both metals and nonmetals
  6. 9. is an uncharged particle