An atom with an atomic number of 18 will have how many electrons in its innermost orbit

At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure

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?

How might this scientific phenomena be explained? a paper clip floats on water.