what is potassium/u0027s mass number element

质量数(massnumber)是指中性原子中,将原子内所有质子和中子的相对

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受害者[4] element ['el01m05nt] n. 要素[5] popularity

file:standard model of elementary particles.svg (cc by 3.0)

viscosity average. weight average= mw. number average = mn.

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