About 80% are metals.
Three quarters is a rough estimate.
All metals except alloys of metals are elements, but not all elements are metals.
This element is iron.
No, not all metals are considered to be elements. Brass for example is a combination of elements but is not an element itself.
No; sulfur and phosphorus are nonmetals.
Non metals
Noble Gases (group 18)
Titanium, Zirconium, Hafnium. All are metals.
Tungsten.
An element that has properties of both metals and non-metals is called Metalloid. Example is Germanium.
An element that has characteristics of both metals and nonmetals is a metalloid.
Solid, like all metals except mercury.
possibly cobalt