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Which two of the ions below have the same number of electrons?
(top:127, bottom:53) I^1-, (top:119, bottom:50) Sn^2+, (top:207, bottom:82) Pb^2+
(top:207, bottom:82) Pb^4+
(top:137, bottom:56) Ba^2+
a) (top:127, bottom:53) I^1- and (top:137, bottom:56) Ba^2+
b) (top:127, bottom:53) I^1- and c) top:207, bottom:82) Pb^2+ and (top:137, bottom:56) Ba^2+
d) (top:119, bottom:50) Sn^2+ and (top:137, bottom:56) Ba^2+
e) top:207, bottom:82) Pb^2+ and (top:207, bottom:82) Pb^4+

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