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kodGreya [7K]
3 years ago
14

What element in the fourth period is an exception to the Aufbau principle? a. Li c. Ca b. Cr d. Br

Chemistry
1 answer:
gulaghasi [49]3 years ago
4 0

The fourth period contains 18 elements, beginning with potassium and ending with krypton. As a rule, period 4 elements fill their 4s shells first, then their 3d and 4p shells, in that order; however, there are exceptions, such as chromium.

Cr. I think

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Left side                      Right side

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Left side                      Right side

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H = 4                           O = 6

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