When a mixture of rock pieces, salt and water is filtered, what will be found as the filtrate and what will be found as the residue

Salt solution will be the filtrate

and the rock pieces will be the residue.

Explanation:

This is because salt is soluble in water and hence

it cannot be filtered out of water giving as a salt solution as the filtrate and since the rock pieces are not soluble in water they are left out and they become the residue.

increased stability in the completion of fluorine's outer shell.