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  1. In Ramsay and Rayleigh’s isolation on noble gases from air,the nitrogen of the
  2. The maximum number of electrons in a subshell is given by the expression
  3. Reaction of solid KMnO₄ ith conc.H₂SO₄ produces manganese heptoxide (Mn₂O₇) in
  4. The ionic radii of isoelectronic species N³⁻, O²⁻ and F⁻ are in the order
  5. Electric configuration of chalcogens in their outermost orbit is