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Question
An element has atomic number 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 ?
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Solution
(a) The atomic number of given element is 13 which is defined by the number of protons in an atom. Thus, there are 13 e-(s) in each atom of the given element because in a neutral atom, number of protons is equal to the number of electrons.
(b) Electronic configuration of given element (2,8,3) is
K = 2; L = 8; M = 3
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