At stp, which element is brittle and not a conductor of electricity

__can be defined as which velocity changes

Which is a chemical property of iron? a. it forms iron oxide (rust) when exposed to moisture and air. b. it is a gray–black metal that is hard to the touch. c. it has a melting point of 2795°f (1536°c). d. it is a good conductor of heat

Define dew point. i am writing this part to be able to ask the question