Keeping in view the size of atoms, which orders is the correct one:
Correct answer: B. Ba > Mg
- A. Mg > Sr
- B. Ba > Mg
- C. Lu > Ce
- D. Cl > I
Explanation
While Ba and Mg are in the same group, Ba has more shells than Mg, leading to a larger atomic size due to the addition of extra electron shells. This trend follows the periodic trend where atomic radius increases down a group due to the addition of shells, and decreases across a period due to increasing nuclear charge pulling electrons closer.
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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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