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Option 4 : 1, 2 and 3
Radon is the heaviest gas.Astatine is the rarest element on the earth.Graphite which is a non-metal is an electrical conductor
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Option 4 : 1, 2 and 3
Radon is the heaviest gas.Astatine is the rarest element on the earth.Graphite which is a non-metal is an electrical conductor