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8. Metallurgy
Physical properties of metals:-
Metals exist mainly in solid state.
(The metals namely, mercury and gallium exist in
liquid state at room temperature.)
Metals possess luster.
Metals possess ductility and malleability.
All metals are good conductors of heat and electricity.
Generally, all metals are hard.
(lithium, sodium and potassium are exceptions. These
metals can be cut with knife as they are very soft.)
Metals have high melting and boiling points.
For example:-tungsten metal has the highest melting point
(3422 0C).
On the contrary, the melting and boiling points of the
metals such as sodium, potassium, mercury, galium are
very low.
A sound is produced when certain metals are struck. This is
called sonority. These metals are known as sonorous
metals.
Contact No:-9511794292
, Physical properties of nonmetals:-
Some nonmetals are in solid state while some are in
gaseous state.
(Exception is the nonmetal bromine which exists in liquid
state.)
Nonmetals do not posses luster
(Iodine is the exception as its crystals are shiny.)
Nonmetals are not hard.
(Diamond which as an allotrope of carbon is the exception.)
Nonmetals have low melting and boiling points.
Nonmetals are bad conductors of electricity and heat.
(Graphite, an allotrope of carbon, is an exception, as it is a
good conductor of electricity.)
Chemical properties of metals :
a. Reaction of metals with oxygen
Metals combine with oxygen on heating in air and metal oxides
are formed.
Sodium and potassium are very reactive metals. Sodium metal
combines with oxygen in the air even at room temperature and
forms sodium oxide.
Contact No:-9511794292
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