Why do the atomic weights on the periodic table keep changing? Kit Chapman meets the team behind the decimal places ...

The team of physicists from The University of Arizona say they were motivated by the possibility of Compact Ultradense ...

Asteroid 33 Polyhymnia is at the center of an exciting new study that suggests it may hold elements that have never been observed on Earth. This groundbreaking research, published in The European ...

How heavy can an element be? An international team of researchers has found that ancient stars were capable of producing elements with atomic masses greater than 260, heavier than any element on ...

Last year, the International Union of Pure and Applied Chemistry (Iupac) revised the atomic weights of gadolinium, lutetium and zirconium. Gadolinium’s standard atomic weight changed from 157.250 to ...

For example, sulfur is commonly known to have a standard atomic weight of 32.065, but its real atomic weight can be anywhere between 32.059 and 32.076, depending on where the element is found.

For elements such as tin, the atomic mass is slightly more than double the atomic number. This is because atomic weight is an average weight of all the isotopes of an element, and an element's ...

Some elements have more than one stable (nonradioactive) isotope —variants of the same substance, but with different numbers of neutrons in their atomic nuclei that alter the mass.

But that was enough to title the paper, “Synthesis of a new element with atomic number Z=117.” That is about the closest thing to “Eureka!” that the dry conventions of scientific ...

One atomic mass unit, or amu, is equal to 1/12 the mass of a single carbon-12 atom. (To put that in perspective, a single carbon atom is roughly equal to 5.857 × 10^-26 ounces.) ...