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Which of the following is the correct order of increasing atomic radius among group 13 elements?
Boron < Aluminium < Gallium < Indium < Thallium
Aluminium < Boron < Gallium < Indium < Thallium
Boron < Aluminium < Indium < Gallium < Thallium
Boron < Gallium < Aluminium < Indium < Thallium
Answers (1)
The atomic radius of group 13 elements increases down the group due to the addition of a new shell at each successive element. However, the shielding effect of inner electrons remains the same, leading to a gradual increase in atomic size. Boron has the smallest atomic radius among group 13 elements, while thallium has the largest atomic radius.
Option 1) is incorrect because the order of increasing atomic radius is incorrect, as thallium has a larger atomic radius than indium.
Option 2) is also incorrect because aluminium has a smaller atomic radius than boron because the order is reversed.
Option 3) is incorrect because the order is incorrect, with gallium having a smaller atomic radius than aluminium.
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