What is a chemical element?
Issue 364 | Page 37 | Published Jan 2017
Contrary to current IUPAC recommendations, the chemical element X should be defined as the nucleus of the X atom. Consequently, different isotopes with their different nuclei belong to different elements, each one with its own physical and chemical properties. This view leads to the conclusion that we no longer have a periodic table of the elements, but a periodic table of isotopes instead.
More from this issue
Set the task for each pupil to collect a single specimen of as many different leaves as possible during 137 seconds.
The double-wall paper cup is an everyday object that can be used in the laboratory to study heat transfer. The experiment described here has been...
Students, as well as teachers, often learn what makes sense to them, even when it is wrong. These misconceptions are a problem. The authors sought...