Number of electrons for all of these even the ones with a number by them ? Will give brain-list

Δu of , in kj/kg, as it isto k, (a)as a of , (b) at , (c) at .

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?

How many neutrons does an element have if its atomic number is 50 and its mass number is 166