The terms theory and model are defined, and students learn how a theory remains valid. Atomic Theory: The Development of the Atomic Theory: The terms theory and model are defined, and students learn ...

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 ...

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 ...

Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. Cadmium, are you looking a bit chubbier these days? Improved ...

The questions in this quiz are suitable for GCSE chemistry students studying early ideas about atoms, the structure of the atom, atomic number and mass number. If you struggled with the quiz, don't ...

Standard atomic weights, those numbers emblazoned under the elements on the periodic table, were once thought of as unchanging constants of nature. But researchers have tweaked the atomic weights of ...

Before you submit an error, please consult our Video Help page. Science Trek is available to stream on pbs.org and the free PBS App, available on iPhone, Apple TV, Android TV, Android smartphones, ...

Scientists have decoded the atomic-level secrets behind catalysts that turn propane into propylene. Their algorithms reveal ...

What makes some plastics stick to metal without any glue? Osaka Metropolitan University scientists have peered into the ...

Countless everyday products from plastic squeeze bottles to outdoor furniture are derived by first turning propane into ...

What Are Atomic Orbitals: Atomic orbitals a concepts derived from quantum mechanics to describe the probability of finding an electron around an atom’s nucleus. The Orbtial Wave Function is a ...