Chlorine

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1. Group VIIA, the halogens
   1. Flourine (Fl)
   2. Iodine (I)
   3. Astatine (At)
   4. Bromine (Br)
2. Symbol: Cl
3. Sources:
   1. in nature only found in combined state
      1. e.g. with sodium in salt
      2. in Sylvite (potassium chloride)
4. Uses:
   1. Make drinking water safe
   2. Bleaching
   3. Refining petroleum
5. Name comes from:
   1. Greek word, chloros, meaning greenish-yellow
6. Atomic number: 17
   1. Number of protons: 17
   2. Number of electrons: 17
   3. Number of neutrons: 18
   4. Atomic mass: 35