you need
  • - periodic table.
As already mentioned, the substances differ in their physical properties. All metals, except for mercury at room temperature are solid.They have a typical "metallic" luster, good conductor of heat and electricity.Most metals are flexible, that is, can easily change its shape when the physical impact on them.
physical properties not metals have far more differences than metals .They may be in liquid (bromine), solid (sulfur) and gas (hydrogen) form.Has low thermal conductivity, and a bad conduct electric current.
distinguish metals from non-metals and their possible structure.In the number of free non-metal atoms at the outer level greater than that of metals.M
etals have a non-molecular structure - they are composed of a crystal lattice.Not metals, by contrast, have a molecular or ionic structure.
Compared to metals, non-metals have higher redox potential and electronegativity.
To distinguish metal from nonmetal , not necessarily to study their physical and chemical properties, it is enough to look at the periodic table.Be aware of the ladder from boron to astatine.Metals are located in the left bottom of the table, as well as by subgroups at the top of the ladder.Not metals - in the remainder of the main subgroups.
addition, many tables do not metals are red and metals - black and green.
There are also amphoteric elements.These substances are capable of various chemical reactions exhibit the properties of both metals and nonmetals.Such elements include zinc, aluminum, tin, antimony.In its highest oxidation state, they are able to exhibit properties characteristic of non-metals.