Posted by cooper on Sunday, September 5, 2010 at 8:05pm.
Look up the atomic number of Cd (from the periodic table). That is the number of protons.
#protons + #neutrons = mass number(115)
# electrons = # protons in a neutral atom. This atom is not neutral and since the charge is +2 it must have two fewer electrons than protons. You can take it from here.
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