What is meant by valency of an element ? give an example

valency of an element is a combining power of an element.

for example oxygen has six valance electron but its valency is 2.

hope it helps.

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.