A metal is a chemical element which can form metal connections
and lose electrons to form cations (positive Ion S) (and ionic
connections in the case of alkaline). Metals are one of the
three groups of elements distinguished by their properties from
Ion isation and Chemical bond; the two others are the Métalloïde
S and the Non-métaux. Although metals can be defined by their
physicochemical properties (see further), it is also possible to
categorize them by employing a characterization of their
structure of band: metals have valence bands and conduction
which is recovered. This definition makes it possible to
integrate into the category of metal metals the polymeric and
others made up Organométallique S. It is however not an always
sufficient criterion. For example, carbon is not a metal but it
has a named phase graphite (it is its phase alpha besides) which
corresponds to this definition. Metals in the periodic tableIn
the periodic Table of the elements the diagonal on the basis of
the Boron (B) and going unt