Question

Which kind of elements have tendency to lose electrons? Give example.

Answer 1

Positive Electrovalency:

1. When an element combines with another element by losing electrons to form a compound, its valency is called positive electrovalency.
2. The elements that have positive electrovalency have the tendency to lose electrons.

Example:

1. Consider a Sodium atom $\mathbf{\left(}\mathbf{Na}\mathbf{\right)}$ having atomic number $11$. Thus, the number of electrons in a Sodium atom are $11$.
2. The electronic configuration of Sodium is $(2,8,1)$.
3. In order to acquire eight electrons in the outermost shell i.e. to attain nearest noble gas configuration, Sodium atom loses $1$ electron from the outermost shell.
4. This leads to formation of Sodium ion having one unit of positive charge $\left({\mathrm{Na}}^{+}\right)$.
5. Thus, the electrovalency of Sodium is $+1$.