copper(II) ion: blue chromium (III)ion : green 1234 copyright protection258ＰＥＮＡＮＡWd7CG1jHrd 尼
iron (II) ion: pale green iron (III) ion : yellow/ brown1234 copyright protection258ＰＥＮＡＮＡtpHi2COHbw 尼
Relative atomic mass of an element is the weighted average isotopic mass of all of the naturally occuring isotopes of the element on the carbon-12 scale 1234 copyright protection258ＰＥＮＡＮＡFO8l1y5WNv 尼
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