Which of the following is an example of a physical property?

water boils at 100 degrees celsius.
iron rusts when exposed to water.
silver tarnishes in air.
gasoline is flammable.

The answer would be a because all the other ones have chemical changes happening.

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.