Hammersmithandcitium is a hypothetical element with atomic number 730. It is named after the Hammersmith & City line, a subsurface London Underground line. Like all elements after lead(excluding stableisotopium), Hammersmithandcitium has no stable isotopes. Its most stable isotope is 1825Hc. It is not found in nature and it can only be created inside a laboratory.
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