Chemistry - GENERAL CHEMISTRY Question with Solution | TestHub

ChemistryGENERAL CHEMISTRYElectronic ConfigurationEasy2 minQB

ChemistryEasysingle choice

Which of the following ground state electronic configurations is incorrect according to the Aufbau principle and Hund's rule?

Options:

Answer:

Solution:

The Aufbau principle dictates filling lower energy orbitals first. The 4s orbital is generally lower in energy than the 3d orbital. Option B, $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{9} 4 s^{1}$ , incorrectly places an electron in 3d before fully filling 4s. The correct filling order would be $...4 s^{2} 3 d^{9}$ (for an element like Copper before considering stability exceptions).

Stream:JEESubject:ChemistryTopic:GENERAL CHEMISTRYSubtopic:Electronic Configuration

⏱ 2mℹ️ Source: QB

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