What are some chemical properties of calcium?

Answer 1

Calcium (elemental) is a dull, silvery, soft metal. It is highly reactive, forming calcium oxide and calcium hydroxide when exposed to air, and violently forms calcium hydroxide on contact with water. It has an oxidation number of 2+, meaning it spontaneously throws off two electrons

Answer 2

Calcium is nature's primary storage method for CO2. The natural process for storing CO2 is in the reaction CaO+CO2>CaCO3 which is the common rock formation we call calcite. There is many times more CO2 locked up in calcite than all the CO2 everywhere else on the planet.