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Question

The atomic numbers of four elements P, Q, R and S are 6, 8, 14 and 16 respectively. Out of these, the element known as metalloid is :

(a) P                       (b)  Q                     (c)  R                      (d)  S


Solution

(c) R.
R (Si) is a metalloid since its atomic number is 14 and it has 4 valence electrons.

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