periodic table

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Across
  1. 3. , the center of an atom made up of protons and neutrons
  2. 6. , the elements that are usually poor conductors of heat and electricity
  3. 14. , Elements in group 8A of the periodic table. Have no charge.
  4. 15. , the number of protons in the nucleus of an atom
  5. 16. metallic elements in group 2 of the periodic table
  6. 17. the basic unit of a chemical element
  7. 18. a horizontal row of elements in the periodic table
  8. 19. a vertical column of elements in the periodic table
Down
  1. 1. , the elements that are good conductors of electrical and thermal
  2. 2. , a negatively charged subatomic particle found in the energy level of an atom
  3. 3. a subatomic particle of about the same mass as a proton
  4. 4. , another name for group
  5. 5. , the total number of protons and neutrons in the nucleus of an atom
  6. 7. , another name for metalloids
  7. 8. He is credited as being the primary creator of the first version of the periodic table of elements.
  8. 9. , capable of being shaped or bent
  9. 10. , group 1 or 1A
  10. 11. ,14 elements with atomic number 58-71 (shiny metals similar in reactivity to to alkaline earth metals)
  11. 12. , an element that has properties of both a metal and nonmetal
  12. 13. Elements of group 7A. Have a charge of -1. Fluorine, Chlorine,