What is the valency of an element that has atomic number $19$ ?

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Solution

The correct option is A $1$
Valency is the combining capacity of an element.
Electronic configuration of given element is:
$Z = 19 : 2, 8, 8, 1$
It has $1$ electron in its valence shell so it can donate that electron to combine with other elements. Hence its valency is one.

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Similar questions

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

(b) 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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