• Tuition Center Singapore JC Chemistry Tuition – Atomic Structure

    Tuition Center Singapore JC Chemistry Tuition – Atomic Structure

     

    Which one of the following is a possible configuration of a stable M3+ ion in the ground state?

    A      1s2 2s2 2p3

    B      1s2 2s2 2p6 3s2 3p1

    C      1s2 2s2 2p6 3s2 3p6 3d2

    D      1s2 2s2 2p6 3s2 3p6 3d2 4s2

    Answer C

    A stable M3+ is either in Group III ion or a transition metal ion. Hence it should have a fully filled s and p orbitals and/or partially filled d orbitals. Electrons from 4s orbital would have been lost first if M is a transition metal

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