an elements x has mass no4and atomic no 2 find the valency of x
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the element x is helium because it have atomic number 2 and it have its duplet complete hence it will have no valence electrons which means that it have 0 valency. 0 valency means that the element is a noble gas and is stable and don't react under normal circumstances
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The answer is helium. Helium has atomic mass 4 and atomic number 2.
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