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Rank the elements in each of the following sets in order of decreasing First Ionization Energy IE$_1$: Sb, Te, Sn

$\begin{array}{1 1} Te > Sb > Sn \\ Te > Sn > Sb \\Sb > Sn > Te \\ Sn > Sb > Te \end{array} $

1 Answer

Answer: Te > Sb > Sn
IE decreases as you proceed down in a group; IE increases as you go across a period.
These are all in Period 5, IE increases across a period.
answered Jul 23, 2014 by balaji.thirumalai

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