Write the valence shell electronic configuration of an element present in the 3rd period and Group IIIA,

The group III-A is called the boron family. The general last shell electronic configuration for the group III-A elements is given as: ns2np1 . The valence shell accommodated three electrons in it.

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ElementAtomic numberValence shell configuration

In495s24d105p1

Tl816s24f145d106p1

Explanation:

Hope it helps ya ItzAlex

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Al= [Ar] 3s^2 3p^1

for the third period the principal quantum number is n=3. the third

nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.