Chad's Videos Error

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@ 16:40 of
Nuclear Chemistry Video Fastmode
in Chad's Videos he wrote the attached picture on the board. Shouldn't the # of protons be 91, not 93?

http://imgur[DOT]com/gallery/CJ8arfD

It appears that my image isn't working. Anyways, what he wrote on the board was that
238, 92 U ----> 2 alpha decays (4,2) + 3 (0,-1) Beta decays + 230, 93 Np

 

[Mrhyde]

Yes I believe that is a mistake:
238, 92 U ---> 4/2 alpha + 4/2 alpha + 0/-1 beta + 0/-1 beta + 0/-1 beta

-------------------4+4+0+0+0= 8 and 238-8 = 230 for mass then 2+2-1-1-1 = 1 then 92 - 1 = 91 for atomic number = 230,91 Pa

we have a combined atomic number of 1 so our missing nuclide will have to have an atomic number of 91 to balance the atomic numbers.