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We consider, for atoms from Cs to Hg, the effective atomic radius ( ), which is defined as the distance from the nucleus at which the magnitude of the electric field is equal to that in He at one half of the equilibrium bond length of He. The values of are about 50% larger than the mean radius of the outermost occupied orbital of 6, < >. The value of decreases from Cs to Ba and undergoes increases and decreases with rising nuclear charge from La to Y b. In fact is understood as comprising two interlaced sequences; one consists of La, Ce, and Gd, which have electronic configuration (4 n−1)(5 1)(6 2), and the remaining atoms have configuration (4 n)(6 2). The sphere defined by contains 85%–90% of the 6 electrons. From Lu to Hg the radius also involves two sequences, corresponding to the two configurations 5 n+16 1 and 5 n6 2. The radius according to the present methodology is considerably larger than obtained by other investigators, some of who have found values of close to < >.


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