Posted by Haile on Tuesday, October 4, 2011 at 9:58pm.
Pt is atomic number 78; therefore, the isotope with 118 neutrons has a mass number of 78+118 = 196. We would write that as, and the board doesn't do a really good job, is
78196Pt
The 78 should be moved over as a subscript on the left hand side. The way I did it is the best I can do on this site.
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