The electron distribution in an aluminium atom is:

2, 8, 3

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2, 8, 2

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8, 2, 3

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2, 3, 8

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Solution

The correct option is A 2, 8, 3
Atomic number of Al = 13.
K, L, M shell will accommodate 2, 8, 3 electrons ( $2 n^{2}$ rule). Therefore, the electronic configuration is 2, 8, 3.

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Class	0-4	4-8	8-12	12-16	16-20	20-24	24-28	28-32	32-36
Frequency	6	8	17	23	16	15	-	4	3

Which shell of an atom can accommodate a maximum of:
(a) 8 electrons (b) 32 electrons?

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