The answer is: when the aim is to show electron distributions in shells
An orbital notation is more appropriate if you want to show how the electrons of an atom are distributed in each subshell. This is because there are some atoms that have special electronic configurations that aren't obvious in just written configurations.
Just add more detail in the second experiment explain every little thing.
Which is an example of a compound? sand, gold, water, or iodine? well, the answer is water, water is a compound.
X is always the independent variable