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The density of osmium is slightly greater than that of iridium; the two are so similar (22.587 versus 22.562 g/cm 3 at 20 °C) that each was at one time considered to be the densest element. Only in the 1990s were measurements made accurately enough (by means of X-ray crystallography ) to be certain that osmium is the denser of the two.
— "Values ranging from 21.3 to 21.5 gm/cm 3 at 20 °C have been reported for the density of annealed platinum; the best value being about 21.45 gm/cm 3 at 20 °C." 21.46 g/cm 3 — Rose, T. Kirke. The Precious Metals, Comprising Gold, Silver and Platinum .
Mercury is the heaviest liquid at room temperature. But the heaviest liquid irrespective of temperature is liquid osmium (a rare metal) at its melting point (3033°C/5491.4°F), with a density of 22.59 g·cm −3, 1.65 times as heavy as mercury. [4]
Note A at Iridium says "At room temperature and standard atmospheric pressure, iridium has been calculated to have a density of 22.65 g/cm3 (0.818 lb/cu in), 0.04 g/cm3 (0.0014 lb/cu in) higher than osmium measured the same way.
Density criteria range from above 3.5 g/cm 3 to above 7 g/cm 3. [17] Atomic weight definitions can range from greater than sodium (atomic weight 22.98); [17] greater than 40 (excluding s-and f-block metals, hence starting with scandium); [18] or more than 200, i.e. from mercury onwards. [19] Atomic numbers are sometimes capped at 92 . [20]
Atomic number (Z): 76: Group: group 8: Period: period 6: Block d-block Electron configuration [] 4f 14 5d 6 6sElectrons per shell: 2, 8, 18, 32, 14, 2: Physical ...
normal range for uric acid in blood [10] 570 μM: inhaled carbon monoxide induces unconsciousness in 2–3 breaths and death in < 3 min (12 800 ppm) [15] 10 −3: mM 0.32–32 mM: normal range of hydronium ions in stomach acid (pH 1.5–3.5) [16] 5.5 mM: upper bound for healthy blood glucose when fasting [17] 7.8 mM
Osmium (76 Os) has seven naturally occurring isotopes, five of which are stable: 187 Os, 188 Os, 189 Os, 190 Os, and (most abundant) 192 Os. The other natural isotopes, 184 Os, and 186 Os, have extremely long half-life (1.12×10 13 years and 2×10 15 years, respectively) and for practical purposes can be considered to be stable as well.