The ionization energy decrease in spite of the increase in _?
Correct answer: B. Proton number and nuclear charge
- A. Nuclear charge
- B. Proton number and nuclear charge
- C. Proton number
- D. None of the above
Explanation
Down the group, ionization energy decreases. Even though an increase in nuclear charge should cause an increase in ionization energy, an increase in the size of the atom and shielding effect override the increase in nuclear charge. Shielding effect increases as the size of the atom increases and it is, therefore, easier to extract an electron.
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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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