Ca++ ion is isoelectronic with
Correct answer: C. Ar
- A. Mg++
- B. Na+
- C. Ar
- D. Kr
Explanation
The Ca++ ion is formed when a calcium atom loses two electrons. The electron configuration of Ca is 1s2 2s2 2p6 3s2 3p6 4s2. When it loses two electrons to become Ca++, the configuration becomes 1s2 2s2 2p6 3s2 3p6, which is the same as Argon's electron configuration. Thus, Ca++ is isoelectronic with Ar. The other options (Mg++, Na+, and Kr) do not have the same electron configuration as Ca++.
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Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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