copper(II) ion: blue chromium (III)ion : green 1234 copyright protection235ＰＥＮＡＮＡTnh4plSiL1 尼
iron (II) ion: pale green iron (III) ion : yellow/ brown1234 copyright protection235ＰＥＮＡＮＡxY40Vy9mFt 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 protection235ＰＥＮＡＮＡImdQZ6e646 尼
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