The two elements a and b have same no of electrons in the penultimate and ante penultimate shells. if a and b form stable ions by the loss of 1 and 2 electrons from their fourth shell then find the atomic no of a and b?

It will fall off and tip over. 

Sorry i dont understand the question can you rephase it?

Answerit curves up and levels out.explanationwe assume that the container contains absolutely no ammonia to begin with as it states that "nitrogen gas and hydrogen gas" react to "produce ammonia."at dynamic equilibrium, the product and reactant concentrations are equal.this means that, starting from a concentration of zero, [nh₃] must curve "up" from zero and then level out to a constant concentration.