What is the first example in the periodic table where the Aufbau principle is not followed? the 3s subshell is lower in energy than the 3d subshell
the 3s subshell is lower in energy than the 2p subshell
the 2s subshell is lower in energy than the 2p subshell
the 4s subshell is lower in energy than the 3d subshell

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.