Nucleon numbers The research team found a new way of calculating the size of atomic nuclei such as the ones represented on this grid. (Courtesy: Serdar Elhatisari) A new way of calculating the size of ...

The covalent radius (a measure of how large individual atoms are) shows different trends if you are moving across a period or down a group. A comparison of the relative covalent radii of atoms is ...

For the first time in history, the standard weights of 10 elements will get expressed in a way that will more accurately reflect how the elements are found in nature. Melissa Block and Michele Norris ...