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It may depend on who you ask, and maybe even when you ask. The tl, dr of what is below is that we are moving towards counting scandium as a transition metal. Wikipedia follows the IUPAC definition and accepts the label for scandium because it forms atoms with partially filled $d$ orbitals, and also copper because it forms ions with partially filled $d$ ...


ynoate refers to a derivative of an alkyne acid. e.g. ethyl-3-butynoate structure here The simplest of these is propiolic acid

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