Any metal is known sometimes as a nonmetal; I suppose that you make a confusion between metals and metalloids.
it is always a non-metal
selenium is a non metal, sometimes considered as a metalloid also.
Argon is known to be non-metal. This forms in a group of 13 or more.
Lawrencium is very probable a solid metal.
'S8' is an allotrope of sulphur. It is a non metal. It is yellow coloured, archaically known as 'Flowers of Sulphur'.
Uranium is best qualified as metal, sometimes with a little metalloid character.
Neon is a non metal, it is also a noble gas.
This type of bond is known as an ionic bond where a metal which is Mg (metal ion) is bonded ionicly to a non-metal Cl2 (non-metal ion).
Tantalum is a metal. It is a transition metal known for its high melting point and corrosion resistance.
Neon is a non-metal
Compounds composed of a metal and a non-metal are known as ionic compounds. In these compounds, the metal atom loses electrons to form a positively charged ion, while the non-metal atom gains electrons to form a negatively charged ion, resulting in an electrostatic attraction between the two ions.
CH3 does not exist by itself but is definitely not a metal.