Which ion below is isoelectronic with the arsenide ion, As3-  ? Hint:  For transition metal cations, it might help to write the electron configuration for the neutral metal and then the metal cation to see exactly which electrons are lost.  Use the periodic table then to "backtrack" to the noble gas.   -S2- -I1- -In3+ -Ti2+ -Te2-

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A: (a)

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