Which of the following lines from the story indicates a flashback?

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?

Which of the following units is not an official si unit

How many grams of sodium chloride are in 250ml of a 2.5m naci solution