Bond type in radium oxide

Radium (Ra) is an alkaline earth metal, and Oxygen (O) is a nonmetal.

Metals like radium have low electronegativity and tend to lose electrons, while nonmetals like oxygen have high electronegativity and tend to gain electrons. The large difference in electronegativity between radium and oxygen indicates an ionic bond.

Radium loses two electrons to form a positive ion (Ra²⁺), and oxygen gains two electrons to form a negative ion (O²⁻). These oppositely charged ions are held together by electrostatic attraction, forming an ionic bond.