Atoms, Chemical Bonds, and the Periodic Table

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Across
  1. 8. The group on the periodic table that has the most reactive elements
  2. 9. The number that tells us how many protons are in an atom of an element
  3. 10. An atom with 8 valence electrons is considered to be ___________
  4. 13. The negatively charged subatomic particle that makes up and atom
  5. 15. The scientist that developed the first periodic table of elements
  6. 17. The group of reactive nonmetals on the periodic table that often react with metals to form salts
  7. 18. Anything that has mass and takes up space
  8. 19. A force that holds two or more atoms together
  9. 21. An atom with 1-7 valence electrons is considered to be __________
  10. 22. The name for the columns on the periodic table
  11. 23. The number that tells us how much one atom of an element weighs in amu
  12. 24. The positively charged subatomic particle found in the nucleus
Down
  1. 1. A chart of elements arranged into rows and columns according to their physical and chemical properties
  2. 2. The region at the center of the atom that contains most of the mass of an atom
  3. 3. The group of nonmetals that are clear, colorless, and unreactive gases
  4. 4. An outermost electron of an atom that participates in chemical bonding
  5. 5. The smallest unit of matter
  6. 6. Matter made up of two or more different kinds of atoms joined together by a chemical bond
  7. 7. The group of metals on the periodic table that are used for jewelry, construction, wires, and coins
  8. 11. Matter made up of two or more atoms (same or different) joined together by a chemical bond
  9. 12. The region surrounding the nucleus of the atom where electrons can be found
  10. 14. The name for the rows on the periodic table
  11. 16. A pure substace made up of only one type of atom
  12. 20. the neutrally charged subatomic particle found in the nucleus