Arrange the following according to increasing ionization energy: Li, Be, Na, Mg
Correct answer: D. Na < Li < Mg < Be
- A. Li < Be < Na < Mg
- B. Be < Li < Na < Mg
- C. Mg < Na < Li < Br
- D. Na < Li < Mg < Be
Explanation
Ionization energy generally increases from left to right across a period and decreases from top to bottom within a group. Using this trend, we can order the given elements as: Li < Na < Mg < Be Therefore, the correct answer is D.
This question appeared on the NUMS 2019 (cancelled sitting) paper, which you can sit online with every answer explained.
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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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