Filtration is used to separate what type of mixture?

It is used to separate an insoluble solute from a liquid.
It is normally filtered by using filter paper, the liquid that passes through the paper is called filtrate, meanwhile the insoluble particles and a bit liquid left on the filter paper is called residue.
We can also separate insoluble solute from liquid by decantation.

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom