On the far right side of the periodic table, just beneath oxygen, sits a lesser-known group of elements called the chalcogens ...

Iron and oxygen bind together throughout the body. Most famously, iron binds dioxygen, or two oxygens paired with each other, in hemoglobin that transports oxygen through blood. But iron-oxo compounds ...

IN his letter in NATURE of March 20 Mr. Soddy states that “granting the possibility of the existence of groups of elements with identical chemical properties and spectra, the only known direct manner ...

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