b)
38/18 E , 40/18 E ----- izotopy argonu
39/19 E , 40/19 E ----- izotopy potasu
40/20 E, 42/ 20 E , 44/20 E --- izotopy wapnia
c)
76/32 E, 74/32E, 70/32E ---- izotopy germanu
76/34 E, 74/34E , 78/34E ------ izotopy selenu
78/36 E, 80/36 E ---- izotopy kryptonu
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b)
38/18 E , 40/18 E ----- izotopy argonu
39/19 E , 40/19 E ----- izotopy potasu
40/20 E, 42/ 20 E , 44/20 E --- izotopy wapnia
c)
76/32 E, 74/32E, 70/32E ---- izotopy germanu
76/34 E, 74/34E , 78/34E ------ izotopy selenu
78/36 E, 80/36 E ---- izotopy kryptonu