The ions Sc3+, Ca2+ and K+ have same electronic configuration as that of
Correct answer: B. Argon
- A. Neon
- B. Argon
- C. Krypton
- D. Xenon
Explanation
The ions Sc3+, Ca2+, and K+ all lose electrons to achieve a noble gas electronic configuration. Scandium (Sc) loses three electrons to become Sc3+, Calcium (Ca) loses two electrons to become Ca2+, and Potassium (K) loses one electron to become K+. In all these cases, they attain the electronic configuration of Argon, which is 1s² 2s² 2p⁶ 3s² 3p⁶. Thus, the correct answer is Argon. Neon, Krypton, and Xenon have different electronic configurations that do not match these ions.
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About Periodic Properties and Trends
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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