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Question

A group of elements in the periodic table are given below.
(Boron is the first member of the group and Thallium is the last)
Boron, Aluminium, Gallium, Indium, Thallium
Answer the following questions in relation to the above group of elements :
(b) Which element would be expected to have the highest electronegativity?

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Solution

Electronegativity increases as the atomic size decreases and effective nuclear charge increases.
  • Boron is the smallest in size and has a higher effective nuclear charge. Therefore, it has the highest electronegativity.

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