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A group of elements in the Periodic Tabl...

A group of elements in the Periodic Table are given pelow (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 :
If the electronic configuration of Aluminium is 2, 8, 3, how many electrons are there in the outer shell of Thallium ?

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