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Caesium (IUPAC spelling; [9] also spelled cesium in American English) is a chemical element; it has symbol Cs and atomic number 55. It is a soft, silvery-golden alkali metal with a melting point of 28.5 °C (83.3 °F; 301.6 K), which makes it one of only five elemental metals that are liquid at or near room temperature .
First respell removed as either confusing or not following Help: Pronunciation respelling key. 10 Ne: Neon Removed as common 11 Na: Sodium Removed as common 12 Mg: Magnesium / m æ ɡ ˈ n iː z i ə m / mag-NEE-zee-əm: 13 Al: Aluminium aluminium: / ˌ æ l (j) ʊ ˈ m ɪ n i ə m / ⓘ AL-(y)uu-MIN-ee-əm: aluminum: / ə ˈ l uː m ə n ə m ...
The complex [Ce(NO 3) 6] 2− is 12-coordinate, a high coordination number which emphasizes the large size of the Ce 4+ ion. CAN is a popular oxidant in organic synthesis, both as a stoichiometric reagent [26] and as a catalyst. [27] It is inexpensive, stable in air, easily handled, and of low toxicity. [27] It operates by one-electron redox.
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).
In Chinese, characters for the elements are the last officially created and recognized characters in the Chinese writing system.Unlike characters for unofficial varieties of Chinese (e.g., written Cantonese) or other now-defunct ad hoc characters (e.g., those by the Empress Wu), the names for the elements are official, consistent, and taught (with Mandarin pronunciation) to every Chinese and ...
Name given to 230 Th, an isotope of thorium identified in the decay chain of uranium. MsTh 1: Mesothorium 1: 88: Name given at one time to 228 Ra, an isotope of radium. MsTh 2: Mesothorium 2: 89: Name given at one time to 228 Ac, an isotope of actinium. Pa: Protactinium: 91: From the Greek protos and actinium. Name restricted at one time to 231 ...
The cation is always named first. Ions can be metals, non-metals or polyatomic ions. Therefore, the name of the metal or positive polyatomic ion is followed by the name of the non-metal or negative polyatomic ion. The positive ion retains its element name whereas for a single non-metal anion the ending is changed to -ide.
The first set of units defined using the caesium standard were those relating to time, with the second being defined in 1967 as "the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom" meaning that: