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

Answer 1

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