A polyvalent metal is a metal that can have different charges. the four polyvalent metals are: copper which can be +1 or +1 (I, II) iron which can be +2 or +3 (II, III) lead which can be +2 or +4 (II, IV) tin which can be +2 or +4 (II, IV
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The Roman numeral tells you the number of electrons a polyvalent cation (usually a transition metal) gives up to participate in the ionic bond. Example: "Iron (III) oxide" means the iron is giving up 3 electrons to form the compound Fe2O3.
It depends on the density of the metal.
A bi-metal is constructed with two dissimilar metals bonded together. The expansion factor is different in each metal. When heat is applied the bi-metal will bend in the direction of the metal with the least amount of expansion factor.
Most of the pencils which I own have no metal at the end.
bronze ****************************** Mercury, as it is the only metal that is a liquid at room temperature.