Question

what is metal and non metals?

Answer 1

which allows pass through them are called metals and which are not allowed currents to pass through them are called non metals

Answer 2

those elements which are malleable,ductile,sonorus,good conductor of electricity and heat are termed as metals.  {electropositive elements}

those elements which are brittle, not malleable nor ductile is termed as a non metals.{ electronegative elements}