Question

what is meant by valency of an element? what is the relationship between the number of valence electrons and valency ​

Answer 1

Explanation:

• Valency is the combining power of an element. Elements in the same group of the periodic table have the same valency. The valency of an element is related to how many electrons are in the outer shell.
• VAlency is the number of electrons an atom loses, gains or shares with other atoms so as to complete the shell. Valence electron is the total number of electrons present in the outermost shell of an an atom

Answer 2

Answer:

It refers to the number of electrons of an atom of the element that is used to combine or mix with the atoms of other elements. It is the combining capacity of an atom of the respective element.

Here’s the relationship between the number of valence electrons and valency:

Valency of an element can be determined by its electronic configuration. It explains about the gain or loss in the total number of electrons in order to derive at the closest noble gas configuration.

For example:

The electronic configuration of Sodium (Na) is 11 i.e. 2, 8, 1. Hence, the valency of Na is 1.

The electronic configuration of Chlorine (Cl) is 17 i.e. 2, 8, 7. Hence, its valency is 1.

Number of valence electrons: The outermost shell of an atom contains the total number of electrons in it. However, it is not mandatory that all the valence electrons would be involved in bonding.

For example:

The electronic configuration of Sodium (Na) is 11 i.e. 2, 8, 1. Hence, the number of valence electrons is 1.

The electronic configuration of Chlorine (Cl) is 17 i.e. 2, 8, 7. Hence, its number of valence electrons is 7.

Hence, we have observed that the valency of an element is directly proportional to the number of valence electrons in that atom.