Question

how will you find the valency of chlorine Sulphur and magnesium​

Answer 1

Answer:

If the number of electrons in the outermost shell of the atom of an element is less than or equal to 4, then the valency of the element is equal to the number of electrons in the outermost shell. ... The distribution of electrons in chlorine, sulphur, and magnesium atoms are 2, 8, 7; 2, 8, 6 and 2, 8, 2 respectively.

Answer 2

DETAILED ANSWER

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What is valency?

It is determined by the number of valence shell electrons present in the atom.

For example Ca

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Atomic number of Ca is :- 20

So its configuration is :-

$1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{6} 4 {s}^{2}$

So,calcium get a noble gas configuration when it looses 2 electron.

Thus the valency of calcium is 2 since it has 2 valence electrons.

For example S

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Atomic number is :- 16

So,its configuration is :-

$1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{4}$

So it needs two electron to achieve a noble gas configuration

So,it becomes stable when it gains 2 electron so,its valency is 2.

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Hope it helped uh ❤