Elements donate 2 electron to produce a cation with a 2+ charge

alkaline earth metals (group-IIA)

Explanation:

The element which donates the electron is known as electropositive element and forms a positively charged ion called as cation. The element which accepts the electrons is known as electronegative element and forms a negatively charged ion called as anion.

Alkaline earth metals donate 2 valence electrons to acquire noble gas configuration.

For example: Berrylium is the first alkaline earth metal with atomic number of 4 and thus has 4 electrons

Electronic configuration of berrylium:

Berrylium atom will loose two electrons to gain noble gas configuration and form berrylium cation with +2 charge.

Thus Elements donate 2 electron to produce a cation with a 2+ charge are alkaline earth metals.

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