We need about 30 vitamins and minerals. Salt(sodium chloride) is needed in large quantities, relative to all the others. The optimum amount daily is about 10 grams(2teaspoons) a day. How do we know this is optimum ? -well this the amount people who live the longest have.
Furthermore when people can’t eat or drink,  (there are numerous reasons for this), they receive  about 9g of salt daily in intravenous fluids.
https://m.primal.net/IPow.jpg