Periodic table trends

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Across
  1. 3. the amount of electrons in the p sublevel
  2. 4. a negative ion
  3. 5. scientist to notice repeating patterns in elements
  4. 10. a row left to right across the periodic table
  5. 11. the amount of electrons in the s sublevel
  6. 12. a positive ion
  7. 14. the number of particles in the nucleus
  8. 16. the amount of electrons in the d sublevel
  9. 17. made of two elctrons
  10. 18. an atom with a positive or negative charge that has gained or lost an electron
Down
  1. 1. the amount of electrons in the f sublevel
  2. 2. the energy needed to pull electrons away from an atom
  3. 6. measure of an atom's ability to take electrons from other atoms
  4. 7. the outermost electrons that are lost in bonding
  5. 8. the number of protons in an atom
  6. 9. a vertical column on the periodic table
  7. 13. the size or distance across an atom
  8. 15. an atom of an element with a different mass number