What are the properties of metal, nonmetal, and mellaloids

Metals: generally shiny, malleable, and hard. They are good conductors of electricity.

Non-metal: do not conduct heat or electricity very well. Are typically brittle and are not easily mold into shapes.

Metalloids: share characteristics of both metals and non-metals and are also called semimetals. Metalloids are typically semi-conductors, which means that they both insulate and conduct electricity. This semi-conducting property makes Metalloids very useful as a computer chip material. 

All the elements are arranged by melting points on the periodic table. in row they go from metals to gasses. in the row from sodium to argon, sodium is more reactive than the one on its right, magnesium.