What are isotopes? 2 Articles

by David Thill

An element is a substance with a certain specific number of protons at its core, the nucleus. By definition, hydrogen is different than helium because hydrogen always has a single proton in its nucleus, while helium always...read more

by Ernest Capraro

Assuming you aren't asking about "The Simpsons", where the Isotopes are Springfield's less than stellar baseball team, read on. Every ELEMENT is defined by the number of PROTONS found in its nucleus. An ISOTOPE is a ...read more