This is how carbon looks on a revised periodic table that uses intervals for the standard atomic weights of some elements. Standard atomic weights, those numbers emblazoned under the elements on the ...

For the first time in history, a change will be made to the atomic weights of some elements listed on the periodic table of the chemical elements posted on walls of chemistry classrooms and on the ...

We like to think of the periodic table of the elements as immutable. It isn’t. Its nether regions have for some time been filling up with new elements that physicists have forged from smaller atoms.