(a) 2, 8

(b) 8, 2, 1

(c) 2, 1, 8

(d) 2, 8,1

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(d) 2, 8, 1

Atomic number of sodium is 11. Its electronic configuration is K shell- 2, L shell- 8 and m shell- 1. It has 1 electron in its valence shell.

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