Which of the following elements has the lowest ionization enthalpy?
Correct answer: B. K
- A. Na
- B. K
- C. Mg
- D. Al
Explanation
In general, ionisation enthalpy increases across the period (left to right) on account of the increase of effective nuclear charge while decreases on moving down the group on account of the increases in the number of shells.
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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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