SYSTEMATIZATION OF ACTINIDES USING CLUSTER-ANALYSIS

A representation of the actinides in multidimensional property space i s proposed for systematization of these elements using cluster analysi s. Literature data for their atomic properties are used. Owing to the wide variation of published ionization potentials, medians are used to estimate them. Vertical dendograms are used for classification on the basis of distances between the actinides in atomic-property space. Th e properties of actinium and lawrencium are furthest removed from the main group. Thorium and mendelevium exhibit individualized properties. A cluster based on the einsteinium-fermium pair is joined by californ ium.