Question 5Elements are broadly classified into metals & non-metals. State six general differences in physical properties of metals & non-metals. State two metals & two non-metals which contradict with the general physical properties — giving reasons. State one difference in property between metalloids & noble gases.

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Six general differences in physical properties of metals & non-metals:S.No.MetalsNon-metals1.Have lustre shineDo not have lustre2.Have high melting and boiling pointsHave low melting and boiling points3.Have high densityHave low density4.Malleable i.e., can be beaten into sheetsNon-malleable i.e., cannot be beaten into sheets5.Ductile can be drawn into wiresNon-ductile cannot be drawn into wires6.Good conductors of heat & electricityPoor conductors of heat & electricityTwo metals that contradict with the general physical properties:Mercury — It is liquid at room temperature.Zinc — It is non-malleable [beyond certain temperatures].Two non-metals that contradict with the general physical properties:Iodine — It is lustrous.Graphite — It is lustrous and conducts electricity.One difference between metalloids & noble gases:Metalloids are chemically reactive whereas noble gases are chemically inert or inactive.

S. No.	Metals	Non-metals
1.	Have lustre shine	Do not have lustre
2.	Have high melting and boiling points	Have low melting and boiling points
3.	Have high density	Have low density
4.	Malleable i.e., can be beaten into sheets	Non-malleable i.e., cannot be beaten into sheets
5.	Ductile can be drawn into wires	Non-ductile cannot be drawn into wires
6.	Good conductors of heat & electricity	Poor conductors of heat & electricity

Elements, Compounds and Mixtures — Question 4

Question 5