The physical and chemical properties of elements are determined by the atomic structure. This, in turn, is determined by electrons and the shells, sub-shells and orbitals they reside in. The rules of placing electrons within shells is known as the Aafbau principle, which originally means ‘building up’.
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Aquarius Weekly Horoscope (January 20 – February 18) Aquarius ‘The Water Bearer’ is the second last …