Electronic configuration of potassium is 2,8,8,1 and calcium 2,8,8,2, when m shell can have maximum of 18 electrons then why next element scandium has electronic configuration 2,8,9,2 and not 2,8,8,3 ?
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Because it is an inner transitional element and its configuration is not 2,8,8 al because it not a stable element
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