Choose the appropriate chapter from the list:

Chapter - Development of the Atomic Model
Atom is made up of three particles : electrons, neutrons and protons. This chapter provides knowledge about atomic structure, atomic theory of matter, and nuclear model of the atom

Chapter - Radio-isotopes and their role in Chemistry
The isotopes of an element are all the atoms that have in their nucleus the number of protons (atomic number) corresponding to the chemical behavior of that element. An isotope that is radioactive is called a radioisotope or radionuclide. This chapter provides knowledge about isotopes, radioactivity, and half life.

Chapter - Emission Spectra and Ionisation Energy
This chapter is about atomic emission spectra and ionisation energy. The atomic emission spectrum of an element is the set of frequencies of the electromagnetic waves emitted by atoms of that element. Each atom's atomic emission spectrum is unique and can be used to determine if that element is part of an unknown compound. Ionisation energy is is the energy required to remove one mole of electrons from the outermost shell of an atom to form a positively charged ion: M_(g) → M⁺_(g) + e-