Could the oldest rocks under our feet be the remains of a planet that is now extinct? This is the kind of question that ...

Isotopes of a given element have the same number of electrons, but their atomic mass and nuclear spin differ through the number of neutrons. The trivial and prominent effect on isotope exchange is the ...

An isotope is one of two or more atoms of the same chemical element with the same atomic number, occupying the same position on the periodic table and having almost identical chemical behavior, but ...