The detection and study of isotopes, atoms of the same element that have different numbers of neutrons, could expand the ...

For the first time those little numbers that appear beneath some of the commonest elements in the periodic table boxes are about to change from a single value to an interval of numbers An ...

Students use the terms isotope, atomic number, mass number, and atomic mass. Atomic Theory: Structure of the Atom: Students use the terms isotope, atomic number, mass number, and atomic mass to ...

Thank you for bringing to my attention the recent International Union of Pure & Applied Chemistry report “Atomic weights of the elements 2009” (C&EN, Dec. 20 ...

What is Mass Number? The answer to this question and other informative content related to molecular chemistry is provided here. Read this article to get the basic knowledge of the atomic number and ...

A problem set is included for students to practice with the concepts of atomic mass and isotopes. At the conclusion of this lecture, students will be familiar with the parts of the atom and will have ...

I was surprised that C&EN would devote two columns to the letter by Harvey Carroll on the matter of atomic weight versus atomic mass (C&EN, Jan. 24, page 4). I realize the majority of the informed ...

Prefer Newsweek on Google to see more of our trusted coverage when you search. Iran has developed the technology to enrich stable isotopes of elements other than uranium, according to the country's ...