Ah, what a delightful question! The element with the electron configuration 2 8 3 is sodium. Just imagine those electrons peacefully arranging themselves around the nucleus, creating a lovely balance in the atom. Sodium is a friendly element that loves to interact with others, bringing joy and stability to chemical reactions.
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Scandium is a transition element, so it has properties quite different. so instead of having 2-8-8-3 it sends 1 electron to the inner L shell and becomes 2-8-9-2
Potassium.
(8)^1/3 + (8)^1/3 + (8)^1/3 = 2+2+2 = 6.
0.375
8/3 = 2.66666 or 2 2/3