September 2018 1 27 Report
Naturalny Rb stanowi mieszanine dwu nuklidów rózniacych sie o dwa neutrony. Masa atomowa naturalnego Rb wynosi 85,47u. Obliczyc procentowe zawartosci obu nuklidów.
odp: 76,5% (85)Rb, 23,5% (87)Rb
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