Please help! Which of the following will an Arrhenius base always produce?

A) H2
B)H2O
C)H+
D)OH-​

Endeleev saw trends in the physical and chemical properties of elements when he organized them by

Which is a character of nuclear fusion but not nuclear fission

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?