Atomic number: The number of protons in the nucleus of an atom of the element. These rules help in identifying and writing ...

Scientists use the periodic table to quickly refer to information about an element, like atomic mass and chemical symbol. The periodic table’s arrangement also allows scientists to discern trends in ...

So, the atomic number also equals the number of electrons orbiting the nucleus. But remember, there are no electrons inside the nucleus. This is the chemical symbol for chlorine, written with its ...