Ignore the answer I have selected but please help!! Ty in advance, also please explain

Are hallucinogen a clinically useful drugs?

What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?

Areaction in which products can react to re-form reactants is