Periodic table and its trend

123456789101112131415
Across
  1. 3. How likely an element is to undergo a chemical reaction
  2. 4. The weighted average mass of an element’s atoms
  3. 5. A vertical column in the periodic table
  4. 8. Group 2 elements, reactive but less so than Group 1
  5. 10. Group 18 elements, nonreactive and stable
  6. 14. The ability of an atom to attract electrons
  7. 15. An element that is dull, brittle, and a poor conductor
Down
  1. 1. Elements in groups 3-12,
  2. 2. Group 1 elements, very reactive
  3. 6. A table that organizes elements by atomic number and properties
  4. 7. An element with properties of both metals and nonmetals
  5. 9. An element that is shiny, malleable, and conducts electricity
  6. 11. A horizontal row in the periodic table
  7. 12. Group 17 elements, very reactive nonmetals
  8. 13. The number of protons in an atom’s nucleus