Keeping in view the size of atom which is in correct order___________________?
Correct answer: B. Ba > Mg
- A. Mg > Sr
- B. Ba > Mg
- C. Lu > Ce
- D. CI > 1
Explanation
Atomic size generally increases down a group because additional electron shells are added. Barium lies below magnesium in Group 2, so Ba > Mg is the correct order. Students may choose Lu > Ce by ignoring lanthanide contraction, which makes lutetium relatively small.
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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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