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1. Calcium

   Linked via "nitride layer"

   Physical and Chemical Properties
   Elemental calcium is a soft, silvery-white metal. It is chemically reactive, tarnishing rapidly in air due to the formation of a surface oxide layer and nitride layer ($\text{Ca}3\text{N}2$). It reacts vigorously with water, liberating hydrogen gas and forming calcium hydroxide:
   $$\text{Ca} (s) + 2\text{H}2\text{O} (l) \rightarrow \text{Ca}(\text{OH})2 (aq) + \text{H}…