__K shell__

The K shell is the first energy level closest to the nucleus and can hold a maximum of 2 electrons.

__Protons__

Protons are positively charged subatomic particles found in the nucleus of an atom. They determine the atomic number of an element, which is the number of protons in the nucleus. It also contributes to the mass of the atom.

__Neutrons__

Neutrons are subatomic particles with no electric charge and are found in the nucleus of an atom along with protons. They play a critical role in determining the stability and mass of the nucleus.

__Electrons__

Electrons are subatomic particles with a negative charge and are found outside the nucleus of an atom in regions called electron shells or orbitals. Electrons do not significantly contribute to the mass of an atom.


The Bohr model describes the structure of an atom as a central nucleus containing protons and neutrons, with electrons orbiting in specific energy levels around it. Electrons can jump between these energy levels by absorbing or emitting energy. This model helps us understand basic atomic properties and electron behavior in atoms.