August 2018 2 29 Report
1. Wskaż grupę izotopów tego samego pierwiastka chemicznego :

a) 40/19 E, 40/20 E, 40/18 E
b) 24/12 E, 23/11 E, 27/13 E
c) 26/12 E, 24/12 E, 25/12 E
d) 41/20 E, 40/20 E, 40/18 E

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