Studying the brightness of a star can help scientist determine what part of the life-cycle a star is in. Is this true or false

Order the following from smallest to largest atom, electron, quark, proton, neutron, molecule, nucleus

Calculate the ratio of h+ ions to oh– ions at a ph = 7. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 7. are they the same? why or why not? record your comparison in table a. what is the concentration of h+ ions at a ph = 7? mol/l what is the concentration of oh– ions at a ph = 7? mol/l what is the ratio of h+ ions to oh– ions at a ph = 7? : 1

Will mark brainliest how many electrons can be held in the energy level n = 4?