the valency of oxygen is 2, derive the valencies of the other elements present in the following oxides: Sodium oxide (Na2O),Zinc oxide(ZnO),Lead oxide(PbO),Aluminum oxide(Al2O3)and Calcium oxide(CaO), Barium oxide, Copper(II) oxide.
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In chemistry, the valence or valency of an element is a measure of its combining capacity with other atoms ... 2 (II), MgCl2, 2 ... Unlike Cs and Ca, Fe can also exist in other charge states, notably 2+ and 4+, and is thus ... The oxidation state of an atom in a molecule gives the number of valence electrons it has gained or lost
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