Q.Assertion (A): The configuration $1s^2 2s^2 2p^6 3s^1$ is for sodium atom in ground state. Reason (R): Electrons are filled in the orbitals in order of increasing energies.

Both A and R are true and R is correct explanation of A

Both A and R are true but R is not correct explanation of A

A is true but R is false

A is false but R is true

The correct solution involves applying the fundamental concept to derive the final value step by step...

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Q.Assertion (A): The configuration 1s22s22p63s11s^2 2s^2 2p^6 3s^11s22s22p63s1 is for sodium atom in ground state. Reason (R): Electrons are filled in the orbitals in order of increasing energies.