Be2+ is isoelectronic with
Correct answer: C. Li+
- A. Mg2+
- B. Na+
- C. Li+
- D. H+
Explanation
Be2+ is isoelectronic with Li+ because both ions have the same number of electrons, which is 2. Be starts with 4 electrons and loses 2 to form Be2+, while Li starts with 3 electrons and loses 1 to form Li+. Mg2+ and Na+ both have 10 electrons each, which is not the same as Be2+. H+ has no electrons, making it not isoelectronic with Be2+.
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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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