Unit 2: Structure of Atoms 43 6. Write down the electronic configuration of A13+. How many electrons are present in its outermost shell?
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the atomic number of Al is 13
the number of electrons in Al⁺³ is 10 [ the +3 indicated that the atom has lost 3 electrons and has become an ion]
so the electronic configuration of Al⁺³ = 1s² 2s² 2p⁶
since all the sub shells are filled with electrons we can conclude that no electrons are present in the valence shell
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