Which statement about $^{131}_{53}$I is correct?
1 )
A negative ion of $^{131}_{53}$I contains 53 neutrons and 52 electrons.
2 )
A negative ion of $^{131}_{53}$I contains 53 neutrons and 54 electrons.
3 )
A negative ion of $^{131}_{53}$I contains 78 neutrons and 52 electrons.
A negative ion of $^{131}_{53}$I contains 78 neutrons and 54 electrons.
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