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

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Lawson Rodgers

Chemistry

11 July, 02:34

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

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Tiffany Nichols · Answer 1

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