Symbol: A one or two-letter abbreviation used to represent the element. Atomic number: The number of protons in the nucleus of an atom of the element. These rules help in identifying and writing ...

They have a radius of around 1 × 10 10 metres. This symbol shows that chlorine has 35 particles in the nucleus (protons and neutrons), 17 of which are protons. It also tells us that chlorine 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 ...