c)Why Boron-5 and Aluminium -13 are not placed in group -3, though they contain 3 electrons each in the outermast orbit.
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Boron and Aluminium are present in Group 13 of the modern periodic table.
Group 13 (IUPAC System) can also be referred to as Group III-A.
Note:-
Logically, Boron and Aluminum can't be placed alongwith elements such as Yttrium as they don't exhibit properties of a transition metal.
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Explanation:
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