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Atomic Physics

Atomic physics (or atom physics) is the field of physics that is primarily concerned with the arrangement of electrons around the nucleus and the processes by which these arrangements change. In other words it is the scientific study of the structure of the atom, its energy states, and its interactions with other particles and as well as its interactions electric and magnetic fields. Atomic physics is one of the most spectacularly successful applications of quantum mechanics, which is a vital part of modern physics. Atomics physics does not include study of electrons and nucleus separately rather it studies atoms as an isolated system of electrons and an atomic nucleus. Generally ions as well as neutral atoms are also taken into consideration, unless otherwise stated. You might only think that atomic physics is often related with nuclear bombs and nuclear power due to the similar use of atomic and nuclear in Standard English. However, in Atomic Physics we study the atom as a system consisting of a nucleus and electrons, and on the other hand nuclear physics—which deals with atomic nuclei alone. In atomic physics atoms are always considered in isolation. Atomic models are consisted of a atomic nucleus (single) which is surrounded by one or more bound electrons. This field of physics is not concerned with the formation of molecules or its solid state conditions. Its main concerns are related with processes such as ionization and excitation by photons or collisions with atomic particles. Modeling atoms in isolation are usually not realistic, because if one considers an atom in a gas or plasma medium, then the amount of atom-atom interactions are huge in comparison to the atomic processes that we are concerned with that is in isolation system. This signifies that individual atoms can be treated as if each were in isolation because for the large majority of the time they are. Considering this, atomic physics provides the underlying principle in atmospheric physics and plasma physics even though both deal with large numbers of atoms. However, the internal structure of the atom became clear only in the early 20th century with the work of the British physicist Ernest Rutherford and his fellow students. Until his efforts, “plum-pudding” model a so-called popular model of the atom had been the advocated by the English physicist Joseph John Thomson was existing. His assumptions were that each atom consists of a number of electrons called as plums embedded in a gel of positive charge called as pudding and the total negative charge and the total positive charge cancel each other, yielding an atom that is electrically neutral.

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