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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 :
(a) Which element has the most metallic character ?

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Solution

  • The metallic character depends on the tendency to lose valence electrons to form positive ions. Metallic character depends on the atomic size and nuclear charge.
  • Down the group, the metallic character increases as the atomic size increases. Therefore, thallium has the maximum metallic character.

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