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Q.

Is the valency of an atom predicted by the number of electrons present in it?


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a

True

b

False 

answer is B.

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Detailed Solution

The above statement is false.
“Valency for an atom or element is defined as the combining power of an element with another atom to form a chemical bond”. The valency refers to the number of electrons present in the outer shell of an atom. For the sodium(Na) atom, the valency is 1 because it shows configuration (2,8,1).
The corrected statement would be that, “The valency of atoms is predicted by a number of electrons present in the valence shell”.
 
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