The 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 of the above
Explanation
In general, as we move from left to right in a period, the ionization energy of the elements increases due to successive increase in the nuclear charge and decrease in atomic size.
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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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