Elements with higher atomic numbers have lower ionization energies than element with lower atomic numbers?

Alidded glass container is filled with a colored gas. after a period of time, it is observed that the gas is uniformly spread throughout the box and that the movement has slowed considerably. next, a warm iron plate is carefully placed under the box. why is there resumed movement of the gas in the container?

Δu of , in kj/kg, as it isto k, (a)as a of , (b) at , (c) at .

What is the oxidation state of an individual bromine atom in nabro3?