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Chemistry

Elements 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.

Elements, Compounds & Mixtures

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Answer

Six general differences in physical properties of metals & non-metals:

S.
No.		MetalsNon-metals
1.Have lustre shineDo not have lustre
2.Have high melting and boiling pointsHave low melting and boiling points
3.Have high densityHave low density
4.Malleable i.e., can be beaten into sheetsNon-malleable i.e., cannot be beaten into sheets
5.Ductile can be drawn into wiresNon-ductile cannot be drawn into wires
6.Good conductors of heat & electricityPoor conductors of heat & electricity

Two metals that contradict with the general physical properties:

  1. Mercury — It is liquid at room temperature.
  2. Zinc — It is non-malleable [beyond certain temperatures].

Two non-metals that contradict with the general physical properties:

  1. Iodine — It is lustrous.
  2. 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.

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