Explanation:Metal can be distinguished by physical properties and chemical properties. Its physical properties are as follows
3)Conduction of heat
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metals show the following properties:hardlustorous conductivity
while non metals don't show any of these properties except in some exceptions
By checking it's properties
It's quite simple
Atomic no =no of proton=no of eletron
So by Atomic no we are able to identify no of elctron.
Simply arrange the electron in a shell .
If it gains electron from others then it is electronegative (Non Metal).
Similarly if it loses electron then it is electropositive (Metal).
All I want to say is Electropositive elements are metal whereas electronegative elements are non metal.
we can distinguish metal and non metal by the below characters
melting and boiling points
conventional current flow in opposite directions of normal current