An element's atomic number refers to — ( I WILL MAKE U BRAINLIEST)

A. the order in which the element was discovered

B. the number of protons in its nucleus

C. the number of atoms it is composed of

D. the number of other elements it will combine with

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?