An atom is the defining structure of an element, which cannot be broken by any chemical means.
The atomic symbol has three parts:-
- The symbol X: the usual element symbol
- The atomic number A: equal to the number of protons
- The mass number Z: equal to the total number of protons and neutrons in an element.
Atomic Radius
This distance between an atom’s nucleus and outer electron shell. The atomic radius is calculated by measuring the distance between the nuclei of two identical atoms bonded together. Half this distance is the atomic radius.