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Question

An element has an  atomic number  of 13 and an atomic mass of 27.
(a) How many electrons are there in each atom of the element?
(b) How are these electrons distributed in the various energy levels?
 


Solution

(a) Number of electrons = 13
(b) Electronic configuration is 2,8, 3 (K,L,M). This is how these electrons distributed at   various energy levels

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