Chemistry Unit Study Guide

12345678910111213141516171819202122232425
Across
  1. 5. elements that are fragile, not malleable, not ductile, poor conductors, some are liquids
  2. 8. elements that have full outer orbitals and do not mix well with other elements
  3. 10. positively charged center of an atom
  4. 11. particles found in the nucleus of an atom that carry a negative charge
  5. 12. particles found in the nucleus of an atom that carry a neutral charge
  6. 14. a thing that is composed of two or more separate elements
  7. 15. chemical reaction that releases energy in the form of heat
  8. 18. man who created the periodic table of elements
  9. 19. the smallest part of an element that can't be broken down any further
  10. 20. particles found in the nucleus of an atom that carry a positive charge
  11. 21. eighteen columns on the P.T.- elements have the same number of valence electrons
  12. 23. mass of a single atom of an element
  13. 25. the basic substances that make up what we know of the universe
Down
  1. 1. compounds formed by a chemical reaction
  2. 2. electrons in the outermost orbital of an atom
  3. 3. elements that are solid, shiny, good conductors, ductile, and malleable
  4. 4. smallest form of a substance composed of one or more atoms
  5. 6. matter can be changed, but total mass does not change
  6. 7. number of protons and electrons in a single atom of an element
  7. 9. short representation of an element
  8. 13. substances initially present in a chemical reaction that are used during the reaction
  9. 16. chemical reaction that absorbs energy, making it cold to the touch
  10. 17. elements that are partial conductors, valuable in computer chips, and crosses between metals and non-metals
  11. 20. seven rows on the P.T.- elements have the same number of orbitals
  12. 22. reaction that occurs in which a layer of metal is bonded to the surface of another substance
  13. 24. regions of space outside the nucleus of an atom where an electron may exist