Why does changing the volume of a container change the pressure of the gas in it?

What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

What is the chemical name of the compound ti2o3? use the list of polyatomic ions and the periodic table to you answer.