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5 October, 01:51

Br - (36) 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6

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  1. 5 October, 05:44
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    Bromine (BR) 1s (1) 2s (2) p (6), 3s (2) p (6),3d (10) 4s (2), p (5)

    Explanation:

    Group 7A elements have a - 1 electron configuration.

    Beginning at the top left and going across the rows of the periodic table provides a method for remembering the order

    1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p.
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