Due to the relativistic stabilisation of 6p1/2 electrons polonium – usually present in the 4+ oxidation state – can be reduced to the 2+ oxidation state. This cation has – outside it's filled [Xe]4f 14 5d 10 electron shells- two electron pairs: 6s 2 and 6p1/2 2. No information is available about the ionic radius of Po 2+ and about it's coordination number of water molecules in aqueous solutions. The measurement of the ionic radius could be one first step towards a better understanding of the contribution of Po 2+ electron orbitals to the chemical bonding. The goal of our studies was to estimate the ionic radius of hydrated Po 2+ from a comparison of the distribution coefficients (Kd) for Po 2+ with K
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