What does nonmetals mean in chemistry

The non-metal are those which never show the property of metals, or this is also called non metals does not allow to flow electrons. It doesn't conduct electric current.

e. g carbon, brone and nitrogen shows the non metal property.

The non metal can show anion cation oxides characteristrics and form stable compounds with hydrogen.

answer; protein;

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.