What is an ion? Describe and give an example.

An ion is a charged atom or molecule. It is charged because the number of electrons do not equal the number of protons in the atom or molecule. An atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom. An example is Iron (III) , Iron (II) , lithium, and hydrogen.

An ion is an atom molecule that has a net electrical charge

They are like other investigations? say there was a murder u have to do blood test and finger prints which run through a lab.