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p-block elements are placed in groups 13 to 18 of the periodic table. Group 15 is nitrogen family. Nitrogen makes various compounds like $NH_3, HNO_3, N_2O, NO_2$, etc. Phosphorus exists in the form of white and red phosphorus. White phosphorus glows in dark. $PH_3$, gas is used as smoke screen. Group 16 is called oxygen family. Dry air contains 21% $O_2$ gas by volume. Combined sulphur exists as sulphates such as gypsum, epsome salt, baryte etc. The allotropic forms of sulphur are Rhombic and monoclinic sulphur. $S_2$ is paramagnetic like $O_2$, and it stable at high temperature. Group 17 is Halogen family. $F_2,$ is highly reactive, $Cl_2$, is greenish yellow gas. Both $SO_2$, and $Cl_2$ are used for bleaching. Group 18 is Noble gas family but some noble gases also form compounds. Complete hydrolysis of $XeF_6$, gives HF and $XeO_6$, as main products.