An element 'x' has a mass number 4 and atomic number 2.Find the valency of 'x'.
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the element is helium and it's valency is 0 . because it has completely filled configuration
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We know that only valence electrons take part in bond formation with different atoms.In the atom of 'X' element there are only two electrons since atomic number is 2. Thus, K shell is fully filled for this atom.Hence,its valency is zero. It will not react with other atoms of different elements.
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