In 1803 was able to prove in the lab what ancient Greeks thought might be true

Which of these is an intensive property of a substance

In general metals get as you move from left to right across the periodic table.

Equal numbers of moles of he(g), ar(g), and ne(g) are placed in a glass vessel at room temperature. if the vessel has a pinhole-sized leak, which of the following will be true regarding the relative values of the partial pressures of the gases remaining in the vessel after some of the gas mixture has effused?