A: No two electrons in an atom can have the s | vedclass

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(A) is the statement of the Pauli Exclusion Principle,which states that no two electrons in an atom can have the same set of all four quantum numbers

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$A$ and $R$ are both true and $R$ is the correct explanation of $A$.

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(A) is the statement of the Pauli Exclusion Principle,which states that no two electrons in an atom can have the same set of all four quantum numbers $(n, l, m_l, m_s)$.$R$ is also a true statement because,according to the Pauli Exclusion Principle,if two electrons occupy the same orbital (same $n, l, m_l$),they must have opposite spins ($m_s = +1/2$ and $-1/2$).Since the restriction on the spins is the direct reason why the four quantum numbers cannot be identical for two electrons in the same orbital,$R$ is the correct explanation of $A$.

$A$: No two electrons in an atom can have the same set of all four quantum numbers.
$R$: Two electrons in an atom can exist in the same shell,subshell,or orbital only if they have opposite spins.

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$A$: No two electrons in an atom can have the same set of all four quantum numbers.$R$: Two electrons in an atom can exist in the same shell,subshell,or orbital only if they have opposite spins.