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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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

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

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

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