Which of the following represents the ground | vedclass

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(B) The ground state of an atom is the state with the lowest possible energy configuration,following the Aufbau principle,Pauli exclusion principle,an

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$1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^0$

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(B) The ground state of an atom is the state with the lowest possible energy configuration,following the Aufbau principle,Pauli exclusion principle,and Hund's rule. Comparing the given configurations: $(A)$ $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^1$ corresponds to Scandium ($Sc$,$Z=21$). $(B)$ $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^0$ corresponds to Calcium ($Ca$,$Z=20$). $(C)$ $1s^2 2s^2 2p^6 3s^2 3p^6 4s^1 3d^1$ is an excited state of Scandium. $(D)$ $1s^2 2s^2 2p^6 3s^2 3p^6 4s^0 3d^2$ is an excited state of Scandium. Since all options represent valid electronic configurations,the question typically refers to the standard filling order. Option $B$ represents the stable ground state of Calcium.

Which of the following represents the ground state of an atom?

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