Your question is oddly worded. Do you mean, “Why isn't metallic, neutral sodium abundant in nature?” The answer is just that metallic sodium reacts violently with the sorts of things the earth is literally covered with. Exposed to water? read more
Sodium and the other alkali metals are highly reactive elements with low ionization potentials. Sodium has only one electron in the 3s orbital of its outermost shell, and it can easily form stable ionic compounds by losing that unpaired electron. read more
Due to the high reactivity of the alkali metals, industrial processes like the purification of iron cannot yield sodium from sodium chloride. Hence, electrolysis is employed in modern industries today to produce sodium, potassium, magnesium and aluminium from their ionic compounds. read more
You'll be dead and I heard that's the reason why nobody really knows the taste of pure or raw sodium. Even taking it hypothetically as you said, 70% of our body is made up of water. There is no way our body can be without water. So as soon as you inject the sodium, vigorous reactions would take place. read more