13
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50 - (27 + 14) = 50 - 41 = 9
27 = 14 + 13 514-14 = 500 500 - 13 = 487
14 neutrons exactly. Just subtract atomic Mass with the atomic number so 27-13=14
134 - 87 = 47 minutes
I - 14
27
Subtract 1.
24
27
27
-27
-it would be 8.