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Sodium: Elements
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Sodium is a Block S, Group 1, Period 3 element. The electronic configuration is [Ne] 3s1. In its elemental form sodium's CAS number is 7440-23-5. The sodium atom has a radius of 185.8.pm and it's Van der Waals radius is 227.pm.
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Sodium is one of the big 8 elements in the Earth's crust, being the sixth most abundant element at about 2.8% by weight. It is a constituent of the plagioclase form of feldspar, one of the most abundant minerals on the earth.
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Sodium is relatively abundant in stars and the D spectral lines of this element are among the most prominent in star light. Sodium makes up about 2.6% by weight of the Earth's crust making it the fourth most abundant element overall and the most abundant alkali metal.
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