Question

what is metals and non metals

Answer 1

those substances which are sonorous, lusturous, melleable, and conduct electricity are called metals.
or
metals have positive ions.
non- metals :- Non metals are just opposite of metals that they are brittle, does not conduct electricity etc.
or
non-metals have negative ions

Answer 2

In chemistry, a nonmetal (or non-metal) is a chemical element that mostly lacks metallicattributes. Physically, nonmetals tend to have relatively low melting and boiling points, and densities, are mostly brittle if solid, and are usually poor conductors of heat and electricity; chemically, they tend to have relatively high ionization energy, electron affinity, and electronegativity values, and gain or share electrons when they react with other elements or compounds.  And
A metal is a material that is typically hard when in solid state, opaque, shiny, and has good electrical and thermal conductivity.