Why the electronic configuration of potassium is $2, 8, 8, 1$ and not $2, 8, 9$ ?

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Solution

Octet rule
The octet rule refers to atoms' preference for having eight electrons in their valence shell.
Atoms with fewer than eight electrons are more likely to react and produce more stable compounds.
Electronic configuration of potassium
The octet rule states that the outermost shell may only hold a maximum of $8$ electrons.
As a result, the electronic configuration of potassium is $2, 8, 8, 1$ rather than $2, 8, 9$ .

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Choose the correct option

(a) Rutherford's alpha-particle scattering experiment discovered

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