Subshell Configuration and Periodic Trends

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Across
  1. 3. rows in the periodic table
  2. 4. how strongly an atom attracts electrons towards itself
  3. 5. columns in the periodic table
  4. 7. positively charged particle inside the nucleus of an atom
  5. 8. region at the centre of an atom that contains protons and neutrons
  6. 12. variants of an element which have the same atomic number but a different number of neutrons in their nuclei
  7. 14. temporary energy level that an electron occupies once it has absorbed energy
  8. 16. when at least two different elements are chemically bonded
  9. 17. size of an atom measured as the distance from the nucleus to the valence shell
  10. 18. a substance containing purely one type of atom
  11. 19. negatively charge particle that exists outside the nucleus of an atom
  12. 20. basic building block of matter made up of subatomic particles
  13. 21. electrons in the outermost shell of an atom
  14. 22. lowest energy level that an electron occupies
Down
  1. 1. subdivision of electrons shells into similar energy levels
  2. 2. attractive force between the positive nucleus and valence electrons, measured as the difference in the number of protons and inner electrons
  3. 6. unreactive gases found in group 18 of the periodic table
  4. 9. tendency of atoms to undergo a chemical reaction
  5. 10. energy required to remove the first valence electron from an atom
  6. 11. outermost energy shell
  7. 13. when two or more atoms are joined chemically (can be two of the same element)
  8. 15. charge atom