how are the metals like Sodium Potassium and Calcium obtained give equations

2Na(s) + 2H2O ? 2NaOH(aq) + H2(g)
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when the metal and nonmetal are reacted each together
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Most of the metals are obtained from molten metal chloride and metal oxide by electrolysis reaction.
For example:- 2NaCl=2Na+ Cl2
In the above example, molten sodium chloride is passed through electricity, it decomposes into sodium metal and chlorine gas.
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