Question

write elements with symbols and their valency ?​

Answer 1

Answer:

Compounds Name of compounds Valency of constituent elements

MgBr2 Magnesium bromide Mg=2,Br=1

K2O Potassium oxide K=1,O=2

NaH Sodium hydride Na=1,H=1

CaCl2 Calcium chloride Ca=2,Cl=1

Answer 2

Valency:-

Valency is the combining capacity of an atom of an element with atoms of other elements to form molecules.

How to Find Valency of Elements?

As we know, the number of electrons in the outermost shell of hydrogen is 1, and in magnesium, it is 2. Therefore, the valency of hydrogen is 1 as it can easily lose 1 electron and become stable. On the other hand, that of magnesium is 2 as it can lose 2 electrons easily and also attain stability.

Furthermore, it is not only determined when an atom loses an electron. For example, fluorine has 7 electrons in its outermost orbital. It is hard to lose 7 electrons and so it completes its octet by gaining 1 electron. Since it gains 1 electron, its valency is 1. In the periodic table, the elements in the same group have the same valency.

For example, all the elements in group 8 have 8 electrons and completely filled orbitals, that is why the valency of all the elements in this group is zero.

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