Kelvi

The correct order of atomic radii in group 13 elements is

medium

Classification of Elements and Periodicity in Properties

2018

chemistry

B $<$ Ga $<$ Al $<$ Tl $<$ In

B $<$ Al $<$ Ga $<$ In $<$ Tl

B $<$ Al $<$ In $<$ Ga $<$ Tl

B $<$ Ga $<$ Al $<$ In $<$ Tl

Explanation

To determine the correct order of atomic radii in group 13 elements, we need to consider the trends in atomic size within the group. $\\$ Group 13 elements include: Boron (B), Aluminum (Al), Gallium (Ga), Indium (In), and Thallium (Tl). $\\$ The general trend in a group is that atomic size increases as we move down the group due to the addition of electron shells. However, there are some exceptions due to the presence of d- and f-electrons. $\\$ Let's analyze the atomic radii order: $\\$ • Boron (B) is the smallest because it is at the top of the group. $\\$ • Aluminum (Al) is larger than Boron (B). $\\$

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