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Chemistry 7 Online
OpenStudy (anonymous):

number of electrons in se2-

OpenStudy (zpupster):

Se's atomic number is 34 so therefore it has 34 protons and electrons. But since it is an ion and has a charge of -2, it tells you that there is 2 more electrons. So because of that, Se2- has 36 elecrons and 34 protons.

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