The Periodic Table and its Trends

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Across
  1. 4. The ability of an atom to attract electrons in a bond.
  2. 7. Reactive elements in Group 17, like chlorine and fluorine.
  3. 8. Creator of the periodic table, organized elements by atomic mass.
  4. 9. The size of an atom, measured from the nucleus to the outermost electron.
  5. 10. Metals in the center of the periodic table, with varying oxidation states.
  6. 13. A column in the periodic table with similar chemical properties.
  7. 14. Gases in Group 18, chemically inert due to full electron shells.
  8. 15. Elements that are shiny, malleable, and good conductors of heat and electricity.
Down
  1. 1. The process of an atom gaining or losing electrons to form ions.
  2. 2. The mass per unit volume of a substance.
  3. 3. A horizontal row in the periodic table, with elements sharing the same electron shell count.
  4. 5. The effect where inner electrons reduce the attraction of the nucleus on outer electrons.
  5. 6. Negatively charged particles that orbit an atom's nucleus.
  6. 11. Reactive metals in Group 1, like sodium and potassium.
  7. 12. A predictable pattern in element properties across the periodic table.