Some security experts are worried that a cache of radioactive material reportedly stolen from an oil field in Iraq could be used by organizations such as the Islamic State group to produce a dirty ...

This week's element is iridium, which has the atomic number 77, and the symbol Ir. Iridium is a silvery-white metal that is very hard and brittle. It also has a very high melting point, making it ...

One of the ways that we know when and where comets came crashing into Earth is by checking the ground for iridium. Although this platinum-colored metal is common in space, Earth’s supply of iridium ...

The oxidation state of an atom in a molecule is an important means of electron bookkeeping and determining structure and bonding, so the question of just how high oxidation states can go has long ...