Chemistry

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Across
  1. 2. The atomic __ of an element = the # of protons
  2. 4. Atoms with the same # protons but not neutrons
  3. 7. Electrons Electrons on the outer energy levels of an atom
  4. 8. Atoms with an unequal # of electrons and protons
  5. 9. ___ share metal and nonmetal properties
  6. 11. The mass of the atom is in here
  7. 13. Matter is classified in ___ and compounds
  8. 16. Matter is classified in___, or elements.
  9. 18. The (-) charge substomic particle
  10. 19. Horizontal rows on a periodic table
  11. 22. Short for atomic mass unit
  12. 23. The only person to have an element named after them while living
  13. 24. Mass The weighted average mass of atomic masses from an atoms isotopes
  14. 26. Ions with a (-) charge
  15. 27. Earth Metals Made up of lanthanides and actinides
  16. 28. The vertical columns on the periodic table are groups
  17. 29. __ forms by losing electrons
Down
  1. 1. A ___ atom has an equal # of protons and electrons
  2. 3. The simplest form of a pure substance
  3. 5. Metals are great ___ of heat and electricity
  4. 6. Elements in the same family share similar __
  5. 10. ___ was the first to use the term atom instead of atomos
  6. 12. Mendeleev created the modern version
  7. 13. The father of the modern day periodic table
  8. 14. good heat/electricity conductors, shiny, etc.
  9. 15. Mixtures where one substance dissolves in another
  10. 17. __ ions form by gaining extra electrons
  11. 20. The atomic __ of Potassium is K
  12. 21. Gases __ __ are the least reactive family of the element
  13. 25. The (+) charge subatomic particles in nucleus