What is the definition of acid ? WILL MARK BRAINLIEST (if the answer is good and hasn't been copied from google and the first one who answer the question )

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?

If two identical atoms are bonded,what kind of molecule is formed

What does an electron configuration for an atom relate to the atoms placement on the periodic table