Although the process of chromosome partitioning during mitosis is visible through a light microscope, the process of dna replication is not. why?

Because chromosomes are highly condensed during mitosis

Explanation:

Chromosomes are structures of packed and organized DNA molecules together with proteins. They are only visible under a light microscope only when the cell is undergoing the metaphase of cell division ( aligned in the center-metaphase plate). In this phase chromosomes are in their condensed form and easiest to distinguish and study.

DNA replication occurs during the S phase of interphase, which is the phase before cell division.

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added

the atomic number of magnesium is 12. its nucleus must contain 12 protons and no electrons. the atomic number of an atom is determined by the number of protons.

magnesium is an electrolyte injection commonly used to treat low magnesium levels in your blood. it is also used to prevent or control seizures in women with preeclampsia or eclampsia.