Question

How will you find the valency of chlorine, sulphur and magnesium?✔✔✔✔✔✔✔

Answer 1

☆$\red {HELLO\:DEAR}$☆

1. 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. On the other hand, if the number of electrons in the outermost shell of the atom of an element is greater than 4, then the valency of that element is determined by subtracting the number of electrons in the outermost shell from 8.
2. The distribution of electrons in chlorine, sulphur, and magnesium atoms are 2, 8, 7; 2, 8, 6 and 2, 8, 2 respectively.
3. Therefore, the number of electrons in the outer most shell of chlorine, sulphur, and magnesium atoms are 7, 6, and 2 respectively.
4. Thus, the valency of chlorine = 8 −7 = 1
5. The valency of sulphur = 8 − 6 = 2
6. The valency of magnesium = 2.

☆$\green {VISHU\:PANDAT}$☆

☆$\blue {FOLLOW\:ME}$☆

Answer 2

$\huge\underline\mathfrak\pink{Answer}$

By using the atomic number, we can find the valency.

Firstly we have to distribute the electrons and then check how many electrons are there in valence shells.

If there are upto 3 electrons, then the valency is positive. [ as it is easy to lose ]

If there are 4 electrons, the valency is neither position nor negative [ as it can't lose or gain the electrons ]

If there are more than 4 electrons, the valency is Negative. [ as it can gain electrons ]

________________________

★Valency of chlorine :

Atomic number : 17

configuration : 2,8,7

valency : -1

★ Valency of sulphur :

Atomic number : 16

configuration : 2,8,6

valency : -2

★Valency of magnesium :

Atomic number : 12

configuration : 2,8,2

valency : +2