The `CI - C - CI` angle in `1, 1, 2, 2`, tetrachloroethone and tetrachloromethane respectively will be about:

The Cl-C-Cl angle in 1,1,2,2-tetra-chloroethene and tetrachloromethane respectively will be about:

If the radii of Mg^(2+), Cs^(o+), O^(2-), S^(2-) , and CI^(Θ) ions are 0.65, 1.69, 1.40, 1.84 , and 1.81 Å , respectively, calculate the coordination number of the cation in the crystals of MgS, MgO , and C_(s)CI .

If the radii of Mg^(2+), Cs^(o+), O^(2-), S^(2-) , and CI^(Θ) ions are 0.65, 1.69, 1.40, 1.84 , and 1.81 Å , respectively, calculate the coordination number of the cation in the crystals of MgS, MgO , and C_(s)CI .