Nucleons correspond to the number of 

The correct answer is Neutrons and Protons.

• The protons and neutrons collectively present in the nucleus of an atom are called nucleons.
• The nucleons occupy a very small space inside the nucleus.

Key Points

• Neutron is a neutral subatomic particle that is Constitute of every atomic nucleus except ordinary Hydrogen. It has no and a rest Mass equal to 1.67493 × 10⁻²⁷ kg marginally greater than that of the Proton but nearly 1,839 times greater than that of the Electron.
• Neutrons and protons, commonly called Nucleons are bound together in the dense inner core of a nucleus, they account for 99.9 per cent of the atom’s mass.

Additional Information

• Proton stable subatomic particle that has a positive charge equal in magnitude to a unit of electron charge and a rest mass of 1.67262 × 10⁻²⁷ kg, which is 1,836 times the mass of an electron.
• Electron, the lightest stable known. It carries a negative charge, which is considered the basic unit of electric charge. The rest mass of the electron is 9.1093837015 × 10⁻³¹ kg, which is only ¹/_1,836the mass of a proton. An electron is therefore considered nearly massless in comparison with a proton or a neutron, and the electron mass is not included in calculating the mass number of an atom.