Periodic table and its trend

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