Why do lanthanoids mainly show ionic bonding? What is the nature of their melting and boiling points?

Lanthanoids, also known as lanthanides, primarily exhibit ionic bonding due to their electronic configurations and atomic properties. Lanthanoids typically have incompletely filled f orbitals, which can participate in bonding. However, the energy required to participate in covalent bonding is usually higher than the energy needed for ionic bonding. This is because lanthanoids have relatively high electronegativity and tend to lose electrons to attain a ________ _______ ________ ________ ____ ______ _________ __________ _____ _____ _____ ____.
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