JEE CHEMISTRY MCQ: STRUCTURE OF ATOM

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Understanding +4 | -1

Assertion: The configuration of

Be

-atom cannot be

1 s^2 3 s^2

.
Reason: The electrons enter the various orbitals in the order of increasing energy.

View answer and explanation

Correct option: A

Both assertion and reason are true and reason is the correct explanation of assertion

Option A (Both assertion and reason are true and reason is the correct explanation of assertion) is correct because the Aufbau principle explains why

Be

cannot have the configuration

1s^23s^2

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