Why are the metals like Na,K,Ca and Mg never found in their free state in nature?

Explain the following (a) Reactivity of At decreases if it is dipped in HNO_(3) . (b) Carbon cannot reduce the oxides of Na or Mg. (c) mm is not a conductor of electricity in solid state whereas it does conduct electricity in aqueous solution as well as in molten state. (d) Iron articles are galvanised. (e) Metals like Na, K. Ca and Mg are never found in their free state in nature.

Explain the following (a) Reactivity of At decreases if it is dipped in HNO_(3) . (b) Carbon cannot reduce the oxides of Na or Mg. (c) mm is not a conductor of electricity in solid state whereas it does conduct electricity in aqueous solution as well as in molten state. (d) Iron articles are galvanised. (e) Metals like Na, K. Ca and Mg are never found in their free state in nature.

Explain the following: Metals like Na,K, Ca and Mg are never found in their free state in nature.

The metal never found in free state is

Why do gold and silver found in free state in nature ?

Explain the following: (a) Sodium chloride is an ionic compound which does not conduct electricity in solid state whereas it does conduct electricity in molten state as well as in aqueous solution. (b) Reactivity of aluminium decrease if it is dipped in nitric acid. (c) Metals like calcium and magnesium are never found in their free state in nature.

Explain the following: (a) Sodium chloride is an ionic compound which does not conduct electricity in solid state whereas it does conduct electricity in molten state as well as in aqueous solution. (b) Reactivity of aluminium decrease if it is dipped in nitric acid. (c) Metals like calcium and magnesium are never found in their free state in nature.