Astudent thinks that the more protons an atom has, the more reactive it will be. which will best disprove this student's idea?

compare the reactivities of lithium (li) and krypton (kr).
note that rubidium has 48 neutrons.
compare the number of protons in cesium (ce) and xenon (xe).
count the number of neutrons in an atom of helium.

Arotating space station is said to create “artificial gravity”—a loosely-defined term used for an acceleration that would be crudely similar to gravity. the outer wall of the rotating space station would become a floor for the astronauts, and centripetal acceleration supplied by the floor would allow astronauts to exercise and maintain muscle and bone strength more naturally than in non-rotating space environments. if the space station is 200 m in diameter, what angular velocity would produce an “artificial gravity” of 9.80 m/s^{2} 2 at the rim?

Atomic nuclei of almost all elements consist of

Consider a hydrogen atom in the ground state. what is the energy of its electron? =e= jj now consider an excited‑state hydrogen atom. what is the energy of the electron in the =5n=5 level? =e5= j