How can nonpolar molecule contain polar covalent bonds

What is the maximum number of electrons that an atomic orbital can contain?

Consider the reaction: n2(g) + o2(g) ? 2no(g) kc = 0.10 at 2000oc starting with initial concentrations of 0.040 mol/l of n2 and 0.040 mol/l of o2, calculate the equilibrium concentration of no in mol/l how would this be done?

What type of radiation is lead emitting in the following equation? alpha particles beta particles gamma rays