Periodic Table & Parts of an Atom

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Across
  1. 2. the center of an atom, which contains the protons and neutrons
  2. 7. a negatively charged subatomic particle
  3. 12. solid, liquid, gas
  4. 14. basic unit of matter
  5. 15. protons, neutrons, electrons
  6. 16. An element found in group 17 of the periodic table
  7. 18. non-reactive elements in group 8A of the periodic table. Have no charge and are gases under normal conditions. (Helium, Neon, Argon, Krypton, Xenon, Radon)
  8. 20. two or more elements chemically bonded together
Down
  1. 1. Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorous, Sulfur, Selenium (CHNOPSSe)
  2. 3. number of protons and neutrons
  3. 4. A table that shows the elements, their atomic number, symbol, and average atomic mass; elements with similar chemical properties are grouped together.
  4. 5. An abbreviation for an element or atom
  5. 6. metallic elements in group 2 of the periodic table which are harder than the alkali metals and are also less reactive
  6. 8. a group of atoms chemically bonded together
  7. 9. highly reactive elements in group 1 of the periodic table
  8. 10. Elements that may accept or donate electrons readily and possess a mixture of metallic and nonmetallic properties
  9. 11. a row of elements in the periodic table; members of a period have the same total number of electron energy shells
  10. 13. elements that form a bridge between elements on the left and right sides of the periodic table
  11. 17. A column of elements with similar properties on the periodic table
  12. 18. A subatomic particle that has no charge and that is found in the nucleus of an atom
  13. 19. A positively charged particle found in the nucleus of an atom