Periodic Table

Edit Answers
12345678910111213141516171819
Across
  1. 7. _________ are the electrons in the outermost shell, or energy level, of an atom.
  2. 10. The ________ of a chemical element is a measure of the size of its atom, usually the mean or typical distance from the center of the nucleus to the outermost isolated electron.
  3. 12. _______ are natural materials that do not produce heat or electricity and that are structurally brittle
  4. 16. any of a group of rare gases that include helium, neon, argon, krypton, xenon, and sometimes radon and that exhibit great stability and extremely low reaction rates.
  5. 17. _______, any of the six chemical elements that comprise Group 2
  6. 18. The number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
  7. 19. Periodic ______ are specific patterns that are present in the periodic table that illustrate different aspects of a certain element.
Down
  1. 1. In chemistry and atomic physics, an _______ may be thought of as an orbit followed by electrons around an atom's nucleus.
  2. 2. ________, any of the six nonmetallic elements that constitute Group 17
  3. 3. As its name implies, _______ is the act of emitting radiation spontaneously.
  4. 4. ________ is a chemical property that describes the tendency of an atom or a functional group to attract electrons toward itself.
  5. 5. The ________ of a substance is the temperature at which it changes state from solid to liquid.
  6. 6. _______ is the ability of matter to combine chemically with other substances.
  7. 8. The temperature at which a liquid boils and turns to vapor.
  8. 9. ________, any of the six chemical elements that make up Group 1
  9. 11. The _______ of an isotope and the relative isotopic mass refers to a certain specific isotope of an element.Density
  10. 13. __________ is the name given to the set of chemical properties associated with elements that are metals.
  11. 14. In chemistry, the _______ of an element is the measure of its combining capacity with other atoms when it forms chemical compounds or molecules
  12. 15. As has been mentioned, March 1, 1869 is considered as the _______ of the Periodic Law.