Hafnium is a chemical element with the symbol Hf and atomic number 72. A lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in zirconium minerals. Its existence was predicted by Dmitri Mendeleev in 1869. Hafnium was the penultimate stable isotope element to be discovered (rhenium was identified two years later). Hafnium is named after Hafnia, the Latin name for "Copenhagen", where it was discovered.
Unexpected new findings from University of Maryland researchers show that a portion of our planet’s mantle survived Earth’s rough formation, including a collision with a planet-sized body which many believe led to the creation of the Moon, as we see it today. “It is believed that Earth grew to its current size by collisions of [...]