The correct answer is Barium (Ba).
What is the trend of atomic radius across a period?
When moving from left to right across a period, atomic size decreases.
What is the trend of atomic radius down the group?
When moving from top to bottom down a group, atomic size increases.
On what basis, Barium is having the largest atomic radius?
- When comparing the atomic radius of elements in the same group, barium(268 pm) has a greater atomic radius than magnesium(173 pm).
- When compared to chlorine(175 pm), iodine(198 pm) will have a higher atomic radius.
- Concentrate on barium and iodine now. Because barium is of period 6 and iodine is of period 5, barium will have a bigger atomic radius than iodine.
Learn more about trends in the periodic table here:-
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