The region of the atom where protons and neutrons are located (B) is called the nucleus.
The region of the atom where electrons are located (A) is called orbits.
An atom is made up of electrons in orbits and protons and neutrons in the nucleus.
In the atom, there is an innermost part where we find the subatomic particles called neutrons and protons. This region of the atom is called the nucleus. Most of the mass of the atom is concentrated here.
The electrons are found to move round this nucleus in circular paths called orbits.
In the figure, label A refers to orbits while label B refers to the nucleus.
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