An element's atomic number defines it. An element with 17 protons will always be chlorine. However an element's mass numbers can vary, which means that it can have different numbers of neutrons.

Everyone at that time imagined the atom as a "plum pudding ... of light emitted by real hydrogen atoms. Bohr's theory that electrons existed in set orbits around the nucleus was the key to ...

Heavy water is a form of water with a unique atomic structure and properties ... molecule of heavy water contains two hydrogen atoms and one oxygen atom. The difference, though, lies in the ...

In fact, each gene in cellular DNA contains the code for a unique protein structure ... carbon atom linked to an amino group, a carboxyl group, a hydrogen atom, and a variable component called ...

Despite being the smallest and lightest atom, hydrogen can significantly ... method for locating it in nanofilms. Hydrogen atoms can readily move into the structure of other materials due to ...

To make an ester, a hydrogen atom must be removed from the hydroxyl ... O\) When looking at the structure of an ester, you can easily name it. Remember that the C=O part of the molecule came ...

While the surface concentrations of these residual ions (~0.4 atom percent of nitrate ... ability to trap and stabilize ...