Question

(a) What do you mean by valency ?

(b) How do we calculate the valency of an element from its electronic configuration ?​ (c) similarly find out the valencies of the first twenty elements. (d) how does the valency vary in a period on going from left to right? (e)how does the valency vary in going down a group. ​

Answer 1

• Valency is the combining power of an element. The valency of an element is related to how many electrons are in the outer shell. ...

• An element's valency is determined by the number of electrons in its outer shell. Hence, the number of valence electrons obtained from the electronic configuration of the element gives the valency i.e. the number of electrons lost, gained or shared by the element to attain the noble gas configuration.

Answer 2

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Required answer-:

A)What do you mean by valency ?

$\rightarrow$Valency is the combining power of an element. The valency of an element is related to how many electrons are in the outer shell.

B)How do we calculate the valency of an element from its electronic configuration ?

$\rightarrow$The valency of an element is determined by the number of valence electrons present in the outermost shell of its atom. The number of electrons lost or gained (or shared) by one atom of an element to achieve the nearest inert gas electron configuration, gives us the valency of the element

C)Similarly find out the valencies of the first twenty elements.

Valency of first twenty elements-:

$\rightarrow$H=1

$\rightarrow$He=0

$\rightarrow$Li=1

$\rightarrow$Be=2

$\rightarrow$B=3

$\rightarrow$C=4

$\rightarrow$N=3

$\rightarrow$O=2

$\rightarrow$F=1

$\rightarrow$Ne=0

$\rightarrow$Na=1

$\rightarrow$Mg=2

$\rightarrow$Al=3

$\rightarrow$Si=4

$\rightarrow$P=3

$\rightarrow$S=2

$\rightarrow$CI=1

$\rightarrow$Ar=0

$\rightarrow$K=1

$\rightarrow$Ca=2

D)How does the valency vary in a period on going from left to right?

$\rightarrow$Valency increases from 1 to 4 and then reduces to zero when we move from left to right across a period. Number of valence electrons increases from 1 to 8 when we move from left to right across a period.

E)How does the valency vary in going down a group.

$\rightarrow$The valency remains same in going down the group.

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