16 points!

what is the difference between descriptive, comparative, and experimental investigations?

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Descriptive Investigations- involve describing and/or qualifying parts of a natural system.
Comparative Investigations-involve collecting data from different populations/organisms under different conditions (so basically a comparison between the two).
Experimental Investigations- involving experiments to test the data hypothesized.

The PDF that I am sharing will help you understand more about these types of investigations.

Descriptive is when something has a very detailed description usually containing ambitious vocabulary

Comparative is a similar to that of a simile. You can also be comparative when you are personifying things. You are comparing the inatimate object to a human

Experimental is when you try to use different and a variety of methods when writing, you would be broad with your choices and go with a different genre, theme or setting

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.