(Po^2-) can be calculated from the Shannon (1976) ionic radii of the cations: 216 pm for 4-coordination, 223 pm for 6-coordination, 225 pm for 8-coordination. The effect of the lanthanide contraction is clear, in that the 6-coordinate telluride ion (Te^2-) has an ionic radius of 221 pm.

The lanthanides also form sesquipolonides of formula Ln₂Po₃, which can be considered to be ionic compounds.

Intermetallic polonides

The

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