Question

Which of two: NaF and NaBr has smaller melting point

Answer 1

Of course sodium bromide

Answer 2

 NaBr has lower melting point than NaF because the size of an atom increases down the group so Br has bigger size .and when it bonds with Na, its electrons are still far from each other so NaBr retains its size .because of thebigger size it melts faster than NaF