Respuesta :
Answer: Ionic bond
Explanation:
An ionic bond is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element or the metal and the element which accepts the electrons is known as electronegative element or non metal.
A covalent bond is formed when an element shares its valence electron with another element. This bond is formed between two non metals.
Alkaline earth metals (M) are gruop 2 elements with 2 valence electrons in their valence shell and thus can easily donate electrons to form [tex]M^{2+}[/tex] cation and thus form ionic bonds.
