Nitrogen

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1. Group VA, the halogens
   1. arsenic (As)
   2. antimony (Sb)
   3. bismuth (Bi)
   4. phosphorus (P)
2. Symbol: N
3. Sources:
   1. Makes up 78% of earth's atmosphere
4. Uses:
   1. fertiliser
   3. freezing food
5. Name comes from:
   1. G one of the constituents of nitre
6. Atomic number: 7
   1. Number of protons: 7
   2. Number of electrons: 7
   3. Number of neutrons: 7
   4. Atomic mass: 14