The atomic number of a certain element is 17. Determine the number of electrons in each shell of the atom.

Solution

The electronic configuration of the element with atomic number 17 is

stack stack 1 space straight s squared with underbrace below with space straight K space Shell below space space space stack stack 2 straight s to the power of 1 2 straight p to the power of 6 with underbrace below with straight L space shell below space space space stack stack 3 straight s squared 3 straight p to the power of 5 with underbrace below with straight M space shell below

Thus:
(i) K shell has 2 electrons.
(ii) L shell has 8 electrons.
(iii) M shell has 7 electrons.

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