Keeping in view the size of atom which order is correct one?
Correct answer: C. Lu > Ce
- A. Mg > Sr
- B. Ba > Mg
- C. Lu > Ce
- D. Cl > I
Explanation
Within the same group (column) in the periodic table, atomic size increases as we move down. Therefore, considering the elements you provided, the correct order based on increasing size is Lu (lanthanide element at the bottom of Group 3) > Ce (lanthanide element higher in Group 3).
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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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