Historically the dining room is furnished with a rather large dining table and a number of dining chairs; the most common shape is generally rectangular with two armed end chairs and an even number of un-armed side chairs along the long sides.
Protons and neutrons do not have the same mass. Their masses are quite close, but they are noticeably different. For some purposes it is okay to equate the neutron and proton mass, but it's just an approximation.Also, neutrons decay into a proton, an electron and an antineutrino.rotons and neutrons do not have the same mass. Their masses are quite close, but they are noticeably different. For some purposes it is okay to equate the neutron and proton mass, but it's just an approximation.
Could there be anything smaller inside of an electron or inside of a neutron or a proton? What kinds of quarks are protons and neutrons made of? What was the old name for the Top and Bottom quark? What is the charge of an up quark and the charge of a down quark? How many quarks make up a proton and a neutron? Are quarks confineable for study?