PHYSICAL Properties of metals Submitted by, Aleena Raju Physical science

METALS

Elements Substance Objects ALL THE OBJECTS IN THIS NATURE IS MADE UP OF DIFFERENT TYPES OF SUBSTANCE AND THESE SUBSTANCES ARE FORMED FROM DIFFERENT TYPES OF ELEMETS Elements Substance Objects

Are there any metals in this list .? HYDROGEN IRON GOLD POTASSIUM

Are there any metals in this list .? HYDROGEN  IRON  GOLD  POTASSIUM 

Most of the elements in the periodic table are Metals

Physical state Most of the Metals exist as solid at room temperature , except Mercury (Hg) , Gallium (Ga) and cesium (Cs) Mercury Gallium

GENERAL PROPERTIES OF METALS METALS ARE MALLEABLE Metals can be beaten into thin sheets by hammering , this property is known as “MALLEABILITY” Eg: Gold is the most malleable metal A solid gold sheet can be made into an ornament. Aluminum foil. Iron e.t.c

2. METALS ARE DUCTILE Metals can be drawn into thin fine wires. This property is known as “DUCTILITY” Eg: platinum is the most ductile metal aluminium , copper , tungsten

3. METALS ARE HARD All metals are hard except sodium and potassium, which are soft and can be cut with a knife. Hard metals * Soft metals

4. METALS HAVE METALLIC LUSTRE Metals have the quality of reflecting light from its surface and can be polished (poses a shining appearance) Eg: gold , aluminium , copper

5. METALS ARE GOOD CONDUCTORS OF HEAT Metals have the ability to conduct heat , that is ,metals are “THERMAL CONDUCTORS” Eg: Silver is the best thermal conductor among metals Aluminium, copper e.t.c poses comparatively high high thermal conductivity. Lead is the poorest conductor of heat

6. METALS ARE GOOD CONDUCTORS OF ELECTRICITY That is ,they have the ability to let electricity pass through , it is known as electrical conductivity. Thus metals are “ELECTRICAL CONDUCTORS”. Eg: silver is the best electrical conductor among metals . Copper- electrical wire that is used in our house Aluminium- electrical wire that is used in electrical post

7. METALS ARE SONOROUS That is, they have a unique ringing sound if you strike them with something hard. This property of the metals is known as “SONORITY”

8. METALS HAVE HIGH DENSITY Metals have high density and are very heavy. Ies, Atoms are tightly packed, and this makes them very tough. Iridium and osmium have the highest densities where as , lithium has the lowest density. Iridium Lithium

9. METALS HAVE HIGH MELTING POINT & HIGH BOILING POINT Most metals have high melting and boiling points because in metals there is a very strong intermolecular force of attraction and it needs a lot of energy to melt or to boil Tungsten (high BP) Rhenium (high MP)