Although it is a metal, when at room temperature sodium can be cut through with a butter knife!. In fact, sodium is also critical to the function of the human nervous system and to muscular contractions. In humans, sodium is essential to cellular function for many reasons to maintain fluid balance in the cells and the rest of the body, and for the absorption of nutrients such as glucose. Sodium is an essential element for the nutrition of animals, people and some plants, and humans have known this since prehistoric times. The colour is so bright that it is not usually used with others because it masks them. Another explosive fact: the use of sodium in fireworks is what gives them the gold or yellow colour. It is a highly reactive element: as a pure element sodium has to be kept under oil or kerosene – when exposed to water it ignites. Although shiny and beautiful, sodium tarnishes within a few seconds when it is exposed to the air. 
Sodium ions have therefore been seeping out of the earth’s minerals for eons. This is due to the fact that sodium is highly water soluble. On top of being highly abundant in the Earth’s crust, sodium and chloride also happen to be the most common dissolved elements (as measured by weight) in the oceans.
Despite this, it comprises of about 2.6% of the Earth’s crust, making it the most abundant alkali metal and the sixth most abundant element on Earth, where it exists in minerals such as rocksalt, feldspars, and sodalite.As a free metal, sodium does not exist in nature and must be prepared from its compounds, which have been used for centuries.
Sodium element block plus#
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