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 ...

In fact, the periodic table is arranged in order of increasing atomic number. A second number is needed to fully describe an atom. This number is called the mass number. Since the mass of an atom ...

The Atomic Mass Data Center and its electronic bulletin are tools for the exchange of information on experimental masses, evaluation of masses, extrapolation of masses, and theoretical masses. One of ...

This Q-value calculation programme allows you to calculate reaction Q-values and threshold energies and decay Q values based on the 1995 Update to the Atomic Mass Evaluation and to retrieve other ...

This process, known as atomic level manufacturing (ALM), is well underway at Nanjing University’s Institute of Atom Manufacturing (IAM). Compared to traditional nanomanufacturing, “the scale ...

AP/Wide World Photos In 1932, James Chadwick discovered the neutron, a small atomic particle with mass but no charge ... have actually split the uranium atom in two -- at that point a barely ...