Answer 1

Five physical properties of non-metals are:

1. Non-metals are brittle. They are neither malleable nor ductile.
2. Non-metals are bad conductors of heat and electricity (except graphite).
3. Non-metals are non lustrous (dull) and cannot be polished (except iodine).
4. Non-metals may be solids, liquids or gases at room temperature.
5. Non-metals are neither tough nor strong.