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Atomic radius in group 4:
- titanium=140 pm
- zirconium=155 pm
- hafnium=155 pm

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How does the size of elements vary down the group in the periodic table?

Atomic size increases down the group. The number of shells increases causing more atomic radius.


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The group trend for atomic radius is that it tends to increase down a group in the periodic table. This is because as you move down a group, the number of electron shells increases, leading to a larger atomic radius. Additionally, the effective nuclear charge decreases down a group, which also contributes to the increase in atomic radius.


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The element in group 3A with the largest atomic radius is thallium (Tl). As you move down a group on the periodic table, the atomic radius tends to increase due to the addition of more electron shells. Thallium, being lower in the group, will have a larger atomic radius compared to other elements in group 3A.


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