The four quantum numbers of the LAST electron to be placed into a Ca atom are ________. A)n = 4,ℓ = 1,m_ℓ = 0,m_s = -1/2 B)n = 3,ℓ = 0,m_ℓ = 1,m_s = -1/2 C)n = 4,ℓ = 1,m_ℓ = 0,m_s = +1/2 D)n = 4,ℓ = 0,m_ℓ = 0,m_s = -1/2 E)n = 4,ℓ = 2,m_ℓ = 0,m_s = +1/2

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The last electron of a calcium (Ca) atom fills the 4s orbital. The quantum numbers for an electron in the 4s orbital are n = 4 (principal quantum number), ℓ = 0 (angular momentum quantum number, indicating an s orbital), mℓ = 0 (magnetic quantum number, indicating the orientation of the orbital, which for s orbitals is always 0), and ms = -1/2 or +1/2 (spin quantum number, which can be either -1/2 or +1/2, but since it's the last electron to be placed, either value could technically be correct, but only -1/2 is provided as an option here).

The Four Quantum Numbers of the LAST Electron to Be