Periodic Table and Its Trends !!!!!

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Across
  1. 2. Atoms with the same number of protons but different mass numbers
  2. 4. The modern periodic law is based on this property
  3. 7. The mass of an atom's protons and neutrons combined (2 words)
  4. 9. These two elements make up the noble gas group, one starts with an N and another with an H
  5. 13. These are defined as the most reactive metals on the periodic table (2 words)
  6. 15. Energy required to remove an electron
  7. 16. Horizontal rows on the periodic table
  8. 18. Increases across a period from left to right
  9. 20. Family of gases that rarely react
  10. 21. Element that's in period 4 group 18
  11. 22. Elements with similar properties are grouped into these on the periodic table
Down
  1. 1. Metalloid elements found along this line on the periodic table (2 words)
  2. 3. List that displays all known elements in an organized way
  3. 5. Element used to make fireworks green (2 words)
  4. 6. Smallest particle of an element that remains stable
  5. 8. Group number for the halogens
  6. 10. This type of elements are highly reactive due to having few valence electrons
  7. 11. Property that allows metals to be hammered into sheets (2 words)
  8. 12. Property of metals that allows them to be drawn into wires
  9. 14. This force is strongest between elements with high electronegativity differences
  10. 17. Describes the shape of an orbital
  11. 19. Metals, Group of elements on the left side that are typically solid and dense