Question
Metals and Non - metals. (based on physical properties).
| Metals | Non - metals |
| (i) Metals are solid at room temperature with the exception of mercury and gallium which are in liquid state at room temperature. | (i) Non - metals are either solid or gaseous state with the exception of bromine which is in liquid state. |
| (ii) Metals have lustre in their pure state and can be polished to give a highly reflective surface. | (ii) Non - metals usually do not have lustre except iodine and diamond. |
| (iii) Metals are malleable i.e they can be hammered into thin sheets. | (iii) Non - metals are not malleable. |
| (iv) Metals are ductile i.e they can be drawn into wires. | (iv) Non - metals are not ductile. |
| (v) Metals are good conductors of heat and electricity | (v) Non - metals do not conduct heat and electricity except graphite as it is good conductor of electricity |
| (vi) Metals have high density | (vi) Non - metals have low densities. |
| (vii) Metals are sonorous | (vii) Non - metals are not sonorous |
| (viii) Metals are hard. Exceptions: Li, Na and K are soft metals and can be cut easily with a knife | (viii) Non - metals are not hard. Exception: Diamond |
| (ix) Metals have high melting and boiling points. Exception: Na, K are having low melting and boiling points. | (ix) Non - metals have low melting and boiling points. |
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