Question

I want to ask that why there is a square bracket used in some Chemical Formula's in Chemistry. For example, I would like to refer the chemical formula of Sodium hexa-metaphosphate which is $Na_{2}[Na_{4}(PO_{3})_{6}]$ Na₂[Na₄(PO₃)₆]

Answer 1

Answer:

Because the square. brackets represent multiply sign

hope it helps

pls choose me brainlieast