Subshell Configuration and Periodic Trends

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