a black metal
Bismuth is a metal. It is a post-transition metal and is the most diamagnetic element, meaning it is a poor conductor of electricity and is typically used in cosmetics and medicines.
poor conductor of heat
Selenium is a non metal, and non metals are poor conductors due to the lack of free electrons or ions.
a poor conductor of electricity is never a metal because metals have low ionization enthalpies and thus electrons can be easily mobilized.
Because it rusts very easily. You woudn't want to use rusty water, believe me.
non metal
Bismuth is a metal. It is a post-transition metal and is the most diamagnetic element, meaning it is a poor conductor of electricity and is typically used in cosmetics and medicines.
not all.. the only poor metal is brass..
it is a non metal because it is a poor conductor of heat
You would have do define what a "poor" metal is. If you are referring to structural strength, at room temperature, it has none, being a liquid. However, it is a very useful metal, and fairly expensive.
Yes, it is a metal but a poor one.
Graphite
Tin (Sb) is a poor metal.
what is the physical property of a non-metal
Yes but with poor results. How about cutting the rusted metal out and replacing it?
That would be an insulator.
Lead is a poor metal and (or) a metalloid: it has some amphoteric properties as well, like bismuth or arsenic. It has some fine metallic properties though.