Which is correct order of ionization energy:
Correct answer: D. Both A and B
- A. Be > Mg > Ca
- B. Na > K > Rb
- C. Rb > K > Na
- D. Both A and B
Explanation
The correct answer is option D: Both A and B. Ionization energy decreases as you move down a group in the periodic table due to increased electron shielding and the greater distance of the outer electrons from the nucleus. This makes the electrons easier to remove. Therefore, the sequences Be > Mg > Ca and Na > K > Rb both correctly depict this trend. Option C is incorrect because it suggests an increase in ionization energy down the group, which is not consistent with the periodic trend.
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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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