What are exceptions in chemistry ? Why elements like Copper,Molybendium,Silver etc. are called exceptions?
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According to the Aufbau principle, these electrons should always fill shells and subshells according to increasing energy levels. Elements such as copper and chromium are exceptions because their electrons fill and half-fill two subshells, with some electrons in the higher energy level shells.
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according to the aufbau principle these electrons should always fill shells and subshells according to increasing energy level. elements such as cooper and chromium are exceptions because there electrons fill and half-fill two subshell with some electrons in the higher energy level shells.
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