First ionization potential of alkaline earth metal is greater than alkali metals because___________________?
Correct answer: C. They have smaller atomic sizes
- A. They are more reactive
- B. They have greater atomic radii
- C. They have smaller atomic sizes
- D. All
Explanation
Alkaline-earth atoms have two valence electrons and generally smaller atomic sizes than the corresponding alkali metals in the same period. Their valence electrons are held more strongly, so removing the first electron requires more ionization energy. Students may choose all because alkaline-earth metals are often less reactive, but greater reactivity is not the direct reason and their radii are not greater.
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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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