The Periodic Table and Trends

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Across
  1. 1. the only element in Group IA (1) that is not a metal
  2. 3. any element in the middle block of the periodic table including scandium and zinc
  3. 6. the distance from the nucleus to the outer electrons of an atom
  4. 8. charged particle
  5. 9. an element generally characterized as being brittle when a solid, not a conductor of heat or electricity, and may form anions
  6. 12. the positively charged subatomic particle
  7. 15. any element in Group IIA (2) including beryllium
  8. 16. the building block of matter
  9. 17. having no charge, having the same number of protons and electrons
  10. 18. the neutral subatomic particle
  11. 19. the negative subatomic particle
  12. 20. an element generally characterized by being a shiny, lustrous solid, malleable and ductile, and a conductor of heat and electricity, and can form cations
  13. 23. all of the electrons that are not in the valence shell
  14. 24. any element in Group IA (1) under lithium
Down
  1. 2. the center of the atom where protons and neutrons exist
  2. 4. a negatively charged particle
  3. 5. the energy required to remove an electron from an atom
  4. 7. an element that shares the same number of protons, but has a different number of neutrons
  5. 10. any element in Group VIIIA (18) including helium
  6. 11. the property of matter that is responsible for electrical phenomena, existing in a positive or negative form, having an unequal number of protons and electrons.
  7. 13. the electrons in the highest energy shell
  8. 14. any element in Group VIIA (17) including fluorine
  9. 20. an element whose properties are between a metal and a nonmetal
  10. 21. where the electrons exist in an atom
  11. 22. a “paws”-itively charged particle