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Which set of elements contains a metalloid?

$ (a)\;K, Mn, As, Ar \\(b)\;Li, Mg, Ca, Kr \\(c)\;Ba, Ag, Sn, Xe \\ (d)\;Fr, F, O, Rn $
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In the Periodic Table and note the location of the stepped line dividing metals and nonmetals.
Elements next to the left or right of this line are metalloids.
As (Arsenic) is a metalloid.
Hence a is the correct answer.
answered Mar 15, 2014 by meena.p

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