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 ...

The present writer has briefly discussed the history of this law, in NATURE, vol. 1. 1894, p. 149. In two unappreciative lines in a footnote to the “Elements of Chemical Philosophy,” published in 1812 ...

In what's being hailed as an important first for chemistry, an international team of scientists has developed a new technology that can selectively rearrange atomic bonds within a single molecule. The ...

Atomic force microscopy (AFM) is a way to investigate the surface features of some materials. It works by “feeling” or “touching” the surface with an extremely small probe. This provides a ...

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 ...

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, ...

Chemists use symbols and formulae to represent elements and compounds. Word equations and balanced chemical equations represent the changes that happen in chemical reactions. Mixtures - AQA There are ...

" We The People" focuses on Iowan Harley Wilhelm. He is the Iowa State chemistry professor who helped stop a world war and ...

The first direct measurements of atomic bromine in the atmosphere confirm that the trace chemical plays an important role in reactions that result in depletion of low-lying ozone and deposition of ...

For example, the atomic number of sodium is 11. Every sodium atom has 11 protons and 11 electrons. It has 11 positive charges and 11 negative charges. The mass number of an atom is its total number of ...