The numbers inside the box represent the number of protons or atomic number while the circles represent the energy levels or shells in the atom. The dots represent the electrons occupying those shells.
The atomic number refers to the number of protons in the nucleus of an atom. It is shown as the number inside the boxes. It serves as the identity of an element.
The electrons occupy shells of particular energy levels according to Bohr model. The circles represent these energy levels. The dots in the circles represent the electrons that occupy those energy levels.
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