What is the ground-state electron configuration for the calcium ion, Ca²⁺? A)1s²2s²2p⁶3s²3p⁶ B)1s²2s²2p⁶3s²3p⁶3d² C)1s²2s²2p⁶3s²3p⁶4s² D)1s²2s²2p⁶3s²3p⁶4s²3d² E)1s²2s²2p⁶3s²3p⁶3d⁴

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The calcium ion, Ca²⁺, has lost two electrons compared to the neutral calcium atom. The neutral calcium atom has the electron configuration [Ar] 4s². When it loses two electrons, it becomes [Ar], which corresponds to the configuration 1s²2s²2p⁶3s²3p⁶.

What Is the Ground-State Electron Configuration for the Calcium Ion