Question

How will you find the valency of sulphur and chlorine...???

Answer 1

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$\large \tt{1. \ Chlorine \ (Cl)}$

Atomic number = 17

Electronic configuration = 2, 8, 8, 7

Cl needs one more electron to complete its octet and become stable.

Therefore, Valency of Cl = -1

Here, '-' sign represents the gaining of electron.






$\large\tt{2. \ Sulphur \ (S)}$

Atomic number = 16

Electronic configuration = 2, 8, 8, 6

S needs two more electron to complete its octet and become stable.

Therefore, Valency of S = -2

Here, '-' sign represents the gaining of electron.






$\large\tt{3. \ Magnesium \ (Mg)}$

Atomic number = 12

Electronic configuration = 2, 8, 2

Mg loses two electron so as to complete its octet and become stable.

Therefore, Valency of Mg = +2

Here, '+' sign represents the losing of electron.

Answer 2

Hey mate!

First, you have to check the number of outermost electrons that each element has. And then, you have to subtract it by 8. Then the final answer is the valency.

Now, in this question, the configuration of Sulphur is 2,8,6. Thus, Suphur has 6 valence electrons. Thus, its valency is 8-6 = 2.Hence, the valency of Sulphur is 2. In the same way, the electronic configuration of Chlorine is 2,8,7. Thus, Chlorine has 7 valence electrons. Thus, its valency is 8-7 = 1. Hence, the valency of Chlorine is 1. If you take Magnesium, its electronic configuration is 2,8,2. Thus, Magnesium has 2 valence electrons. Thus, its valency should be 8-2 = 6. But since it is very hard to lose 6 electrons from its outermost shell, it gains 2 electrons to attain octet. Hence, the valency of Magnesium is 2.

ÑØŤÈ: Vance electrons are the electrons in the outermost shell. Whereas valency is the number of electrons required by an element to attain octet.

Hope it helps :)

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