Which one of the following elements is a non-metal?
Cadmium
Nickel
Phosphorus
Tungsten
Phosphorus is a non-metal, rest all are metals.
Answer the following questions.
(a) Classify the following substances as magnetic or non-magnetic.
copper, phosphorus, iron, cobalt, soil, water, silver mercury, nickel, wood, oil.
(b) In olden times, how as a magnet placed in a compass?