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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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