Emission Spectrum of Hydrogen Atom The emission spectrum of Hydrogen atom has been divided into a number of spectral series, with wavelengths given by the Rydberg formula. These observed spectral lines are due to the electron-making transitions between two energy levels in an atom. Explanation The emission spectrum of the hydrogen atom can be obtained … Read more
Definition of Emission Spectra The emission spectra of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted due to an atom or molecule transitioning from a high energy state to a lower energy state. Emission spectra are obtained when the radiations emitted from substances that have absorbed energy (either … Read more
Definition of Atomic Spectra The atomic spectra are the spectrum of frequencies of electromagnetic radiation emitted or absorbed during transitions of electrons between energy levels within an atom. Each element has a characteristic spectrum through which it can easily be recognized. When a beam of light from the sun is passed through a prism, it … Read more
Definition of Black Body Radiation Black Body Radiation: When radiant energy falls on the surface of anybody, a part of it is reflected, a part is absorbed, and the rest is transmitted. The whole energy is not absorbed because generally, the surfaces of ordinary bodies are not perfect absorbs of radiation. However, if the radiant … Read more
Definition Planck’s Quantum Theory Planck’s Quantum Theory: All electromagnetic radiations are forms of energy. The electromagnetic wave theory believed in continuous generation of radiant energy, i.e., the energy may be emitted or absorbed in any value from infinitely small to infinitely large. However, this theory could not explain the experimental results of many phenomena, such … Read more
Definition of Wave Motion Wave motion is the transfer of energy and momentum from one point of the medium to another medium without the actual transport of matter between two points. Discovery of Wave Motion In the 18th Century, French mathematician and scientist Jean Le Rond d’Alembert derived the wave equation. A thorough and general … Read more
Definition of Mass Number The mass number (symbol A, from the German word Atomgewicht [atomic weight]), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. It is approximately equal to the atom’s atomic (also known as isotopic) mass expressed in … Read more
Definitions of Atomic Number In the symbol representing a particular nuclear or atomic species, the atomic number may be indicated as a left subscript. Atoms of each element contain a characteristic number of protons. In fact, the number of protons determines what atom we are looking at (e.g., all atoms with six protons are carbon … Read more
A nucleon can be either a proton or a neutron. Its role is considered as a component of an atomic nucleus. The number of nucleons in a nucleus describes the mass number of an isotope. Definition of Nucleons A nucleon is one of the subatomic particles of the nucleus of an atom. Each atomic nucleus … Read more
Definition of Nucleus In chemistry, a nucleus is the positively charged centre of the atom consisting of protons and neutrons. It’s also known as the “atomic nucleus”. History The word “nucleus” comes from the Latin word nucleus, a form of the word nux, which means nut or kernel. The term was coined in 1844 by … Read more