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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 - Science

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

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Solution

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

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Lakhmir Singh Class 10 Chemistry (Science)
Chapter 5 Periodic Classification Of Elements
Q 36 | Page 284
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