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The metallization of chemical elements of the periodic table under ambient conditions imposed on this planet. The figure shows the ratio (R/V) for elements of the s, p and d blocks of the periodic table. Here, R is the molar refractivity and V is the molar volume. The shaded circles represent elements for which both R and V are known experimentally. The open circles are for elements in which R is calculated and V is known experimentally [11,20,21]. (Online version in colour.)
