Periodic Table Crossword!

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Across
  1. 2. A tiny, negatively charged particle that moves around the nucleus of an atom.
  2. 4. a chemical element that forms a salt when it reacts with metal
  3. 5. The number of protons in the nucleus of an atom of an element
  4. 9. compound made from two or more nonmetals
  5. 10. Positively charged particle in the nucleus of an atom
  6. 12. A group of atoms bonded together or two or more atoms held together by covalent bonds.
  7. 13. pure substance that consists entirely of one type of atom
  8. 15. Center of an atom
  9. 17. Elements with properties of both metals and nonmetals
  10. 19. The ease and speed with which an element combines, or reacts, with other elements and compounds.
Down
  1. 1. A subatomic particle that is neutral and that is found in the nucleus of an atom
  2. 3. compound made from metal and not metal
  3. 6. shiny, malleable, ductile and good conductors
  4. 7. Unreactive nonmetals. all are colorless, odorless, gases at room temp.
  5. 8. Columns of the periodic table are called
  6. 11. the electrons in the outermost shell of an atom are called
  7. 12. Russian chemist who developed a periodic table of the chemical elements
  8. 14. A horizontal row of elements in the periodic table
  9. 16. the smallest unit of an element that maintains the properties of that element
  10. 18. Group 1 of the periodic table (metals)