angieeq2003 angieeq2003

04-12-2018
Chemistry

contestada

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

Respuesta :

ivannis875 ivannis875

04-12-2018

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

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