The atomic number is shown below the chemical symbol, and the mass number is shown above. In this example the atomic number is 17 and the mass number is 35. This means that each of these atoms has: ...

If you know the proton number and nucleon number you can calculate the number of each sub-atomic particle in an atom. The full chemical symbol for an element shows its nucleon number (A ...

The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic ...

The first time you enter the central processor of The Interchange, you'll find an Atomic Battery lying next to a corpse of a ...

Create a Physics World account to get access to all available digital issues of the monthly magazine. Your Physics World account is separate to any IOP acco ...

As will be explained later ... the formidable task of properly adjusting the positions of a large number of atoms with sub-atomic precision in the model, the procedure is hampered by the fact ...

The clock hands are set by the Bulletin of the Atomic Scientists, a group formed by Manhattan Project scientists at the ... Robert Rosner calls the clock “the canary in the coal mine,” which prompts ...