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Explanation:
1. The mass number, also called atomic mass number or nucleon number, is the total number of protons and neutrons in an atomic nucleus. It is approximately equal to the atomic mass of the atom expressed in atomic mass units.
2. In celestial mechanics, the term stationary orbit refers to an orbit around a planet or moon where the orbiting satellite or spacecraft remains orbiting over the same spot on the surface. From the ground, the satellite would appear to be standing still, hovering above the surface in the same spot, day after day.
3. In physics and chemistry, ionization energy (American English spelling) or ionisation energy (British English spelling), is the minimum amount of energy required to remove the most loosely bound electron of an isolated neutral gaseous atom or molecule.
4. The Lyman limit is the short-wavelength end of the hydrogen Lyman series, at 91.2 nm (912 Å). It corresponds to the energy required for an electron in the hydrogen ground state to escape from the electric potential barrier that originally confined it, thus creating a hydrogen ion.
5.Balmer series occurs when the electron jumps from any higher stationary orbit to the second stationary orbit with n=2, the spectral lines emitted For Balmer series, the initial state n1 is 2 and n2 = 3, 4,…