Question

what kind of element have tedency to lose electron ? give example

Answer 1

Elements can be classified on the basis of their ability to loose electron, gain electron or share electron. The elements that generally tend to loose electrons while making bonds are called cations for example Na⁺ while the elements which gain electrons are called anions for example Cl⁻ . Sodium tends to loose one electron to form Na⁺, react with Cl⁻ to form NaCl.
Those elements who have greater cloud of electrons farther away from the nucleus tend to loose electrons more easily. They have more ability to react with other elements to achieve octet. Some other examples of cations are calcium, magnesium and potassium.
Hope it's helpful to you.

Answer 2

The elements that tend to lose electrons while making ionic bonds with other elements are called as Cations. The ions of these cations are formed after they lose their electrons.

These elements have 1 - 4 valence electrons in their outer shell, which they are ready to lose during bond formation.

Most metals are cations which have a tendency to lose electrons. They are Sodium (Na⁺), Calcium (Ca²⁺), Magnesium (Mg²⁺), Lithium (Li³⁺), Potassium (K⁺), etc.

As we go down the group, the alkali metals get more reactive and hence have a greater tendency to lose electrons.