So now an atom is the smallest particle of an element. There are over one hundred different elements and these are all made of atoms. Presenter: OK. Well, before we get into this further ...

It contains only sulfur atoms, and nothing else, so it is pure. When we mix two different pure substances together, like this, it’s a mixture. This is now a mixture of the elements iron and sulfur.

discrete spectral lines of light emitted by atoms of different elements. Shortly after Rutherford’s discovery of the nucleus, the Danish physicist Niels Bohr began to attack this problem using ...

Earth’s core could contain helium from the early solar system. The noble gas tucks into gaps in iron crystals under high pressure and temperature.

Scientist Stephen Jesse will speak Tuesday at Friends of ORNL on "Building Materials and Devices with Atomic Precision: Perils and Promise" ...

Einsteinium-255, produced through irradiation in ILL’s high-flux reactor, provided a continuous supply of fermium-255, ...

The transplutonium actinides are highly radioactive and rare, making them difficult to study. To examine their chemical ...

In Bohr's model, if an electron orbit is not already filled, then it's easier for the atoms to exchange or share those ...

When two hydrogen atoms get close enough, the electron from each atom feels an attraction from the proton in the other atom's nucleus. This attraction pulls the atoms together. The electrons end up ...

Researchers from the University of Würzburg are opening up new horizons in chemistry: They present the world's first triple ...