Q35 of 149 Page 211

Define valency of an element. What valency will be shown by an element having atomic number 14?

The valency of an element is defined as the capacity of an atom of an element to form chemical bonds. An element having atomic number 14 will show the valency 4.


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An element Z contains two naturally occurring isotopes . If the average atomic mass of this element be 35.5 u, calculate the percentage of two isotopes.

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What is the relation between the valency of an element and the number of valence electrons in its atoms? Explain with examples.

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