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TVXQ (stylized as TVXQ!; Korean : 동방신기; Hanja : 東方神起; RR : Dongbangsingi; lit. Rising Gods of the East), known as Tohoshinki in Japan, is a South Korean pop duo formed by SM Entertainment, composed of U-Know Yunho and Max Changmin. Originally a five-member group which also consisted of members Hero Jaejoong, Micky Yoochun, and ...
List of chemical elements. 118 chemical elements have been identified and named officially by IUPAC. A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z ). [ 1]
The periodic table is a tabular arrangement of the chemical elements, organized by their atomic number, electron configuration, and chemical properties. It is a useful tool for understanding the patterns and trends of the elements and their interactions. Learn more about the history, structure, and significance of the periodic table on Wikipedia.
Atomic number is the number of protons, and therefore also the total positive charge, in the atomic nucleus. The Rutherford–Bohr model of the hydrogen atom ( Z = 1) or a hydrogen-like ion ( Z > 1 ). In this model, it is an essential feature that the photon energy (or frequency) of the electromagnetic radiation emitted (shown) when an electron ...
This is a list of chemical elements and their atomic properties, ordered by Atomic number. Since valence electrons are not clearly defined for the d-block and f-block elements, there not being a clear point at which further ionisation becomes unprofitable, a purely formal definition as number of electrons in the outermost shell has been used.
Allmusic. [ 1] The Secret Code is the fourth Japanese studio album (eighth overall) by South Korean pop group Tohoshinki, released on March 25, 2009 by Rhythm Zone. The album debuted at number two on the Oricon weekly chart. The Secret Code is Tohoshinki's last original studio album to feature members Jejung, Yuchun, and Junsu .
Just as atomic units are given in terms of the atomic mass unit (approximately the proton mass), the physically appropriate unit of length here is the Bohr radius, which is the radius of a hydrogen atom. The Bohr radius is consequently known as the "atomic unit of length". It is often denoted by a 0 and is approximately 53 pm. Hence, the values ...
Predictions ranged from atomic number 90 (thorium) to 99, many of which proposed a beginning beyond the known elements (at or beyond atomic number 93). The elements from actinium to uranium were instead believed to form part of a fourth series of transition metals because of their high oxidation states; accordingly, they were placed in groups 3 ...