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5 August, 21:56

When a calcium atom loses its valence electrona the ion formed has an electron configuration that is the same as an atom of. (1) Cl (2) Ar (3) K (4) Sc

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  1. 6 August, 01:35
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    (2) argon. This is because Ca originally has 20 total electrons with a configuration of 2,8,8,2. When it looses its valence electrons it remains with 18 electrons total (2,8,8 config). Argon has 18 electrons total too (2,8,8 config).
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