Majority of the known elements are metals; only 17
elements are non-metals and eight elements are
They are electropositive elements i.e. they lose
electrons to form cations. They form basic oxides.
All of them have lustre and are, malleable (i.e. can be
spread out into sheets) and ductile (i.e. can be drawn
into wire), are good conductors of heat and electricity.
In the periodic table, "elements of group IA, IIA and
all transition elements are metals. Some of the elements
of group IIIA, IVA, VA and VIA are also metals.
They are electronegative elements i.e. they gain
electrons to form anions. They form acidic oxides. They
are bad conductors of heat and electricity. Most of them
In the periodic table, majority of elements of p- block
i.e. group IIIA, IVA, VA, VIA, VIIA and VIIIA are
These are the elements which exhibit dual character.
That is they show the properties of both metals as well
as non-metals. For example, their oxides are amphoteric
i.e. have basic as well as acidic nature.
Boron (B) of group IIIA
Silicon (Si) and Germanium (Ge) of group IVA.
Arsenic (As) and Antimony (Sb) of group VA.
Tellurium (Te) and Polonium (Po) of group VIA
Astatine (At) of group VIIA.