Question

Aftab collects some articles such as pencil lead from pencil, copper wire from the store room, iron nails, a stick made of aluminium. Now, he wants to know whether they are metals or non-metals.

1. How will Aftab be able to know whether these collected articles are metals or non-metals? Explain.

2. How will Aftab check the electrical conductivity of these articles? Explain by showing diagram.​

Answer 1

Answer:

pencil lead is a non metal

copper wire is a metal

iron nails are metal

stick of aluminium is a metal

Answer 2

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How will Aftab be able to know whether these collected articles are metals or non-metals? Explain.

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The metals are to the left of the line (except for hydrogen, which is a nonmetal), the nonmetals are to the right of the line, and the elements immediately adjacent to the line are the metalloids.

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How will Aftab check the electrical conductivity of these articles? Explain by showing diagram.

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Calculate the electrical conductivity from the resistance, length and area of the current. The resistivity is given as p = RA/l where p is the resistivity, R is the resistance, A is the area and l is the length. The conductivity is s = 1/p where s is the conductivity.

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