2. By Priscilla http://www.webelements.com/

3.  Pale yellow or greenish gas  Non-metal  Not a conductor  Corrosive  Melting Pt: -220 C  Boiling Pt: -188 C

4.  Cubic

5.  Atomic Number: 9  Atomic Weight: 18.998  Protons: 9  Electrons: 9  Neutrons: 10  Symbol: F

6.  Block:P  Period:2  Group:17  Electron Configuration:  [He].2s 2.2p 5

7.  As a refrigerant  Freon in air conditioners

8.  In toothpaste to prevent decay  Add to Drinking water

9.  Never found free in nature  Found in feldspar, fluorite, other minerals  Found in Sun, Meteorites, rocks

10.  Corrosive  Most reactive element  Burns with bright flame  Forms HF, deadly toxic  Reacts explosively with hydrogen  Oxidation number: -1

11.  Causes severe burns on skin  Used to etch glass in light bulbs  Fluorine Video  http://www.youtu be.com/watch?v= wm2AdknTcMI http://www.youtu be.com/watch?v= wm2AdknTcMI