Anyone explain how the bond between po4 works?

Basically, elements that make covalent bonds (like PO4) want to have a full outer shell, meaning that they will have 8 electrons. But, they can share electrons with other atoms. So, since phosphorus has 5 electrons in its outer shell, and oxygen has 6 electrons in its outer shell, an oxygen can be attached to the phosphorus so each atom with be surrounded with 8 electrons. But! There is an extra electron, so, it is taken out. That is why there is a positive 1 charge on po4.

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.