Occurrence
Iron is the most common element within the entire earth; most of the core is iron and there is a substantial amount of iron in the mantle and crust as well. Ruthenium and osmium are two of the rarest elements on earth, with ruthenium only found in small amounts in platinum ores. Osmium is the least abundant stable element in the earth's crust, only found in minor traces in platinum ores. Hassium is only produced in nuclear reactors and has never been observed in nature nor isolated in pure form.
Read more about this topic: Group 8 Element
Famous quotes containing the word occurrence:
“One is absolutely sickened, not by the crimes that the wicked have committed, but by the punishments that the good have inflicted; and a community is infinitely more brutalised by the habitual employment of punishment than it is by the occasional occurrence of crime.”
—Oscar Wilde (1854–1900)