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Fermium is a synthetic chemical element; it has symbol Fm and atomic number 100. It is an actinide and the heaviest element that can be formed by neutron bombardment of lighter elements, and hence the last element that can be prepared in macroscopic quantities, although pure fermium metal has not been prepared yet. [ 5 ]
The femtometre (American spelling femtometer), symbol fm, [1] [2] (derived from the Danish and Norwegian word femten 'fifteen', Ancient Greek: μέτρον, romanized: metron, lit. 'unit of measurement') is a unit of length in the International System of Units (SI) equal to 10 −15 metres , which means a quadrillionth of one metre.
List of orders of magnitude for molar concentration; Factor (Molarity) SI prefix Value Item 10 −24: yM 1.66 yM: 1 elementary entity per litre [1]: 8.5 yM: airborne bacteria in the upper troposphere (5100/m 3) [2]
The femtometre (SI symbol: fm) is a unit of length in the metric system equal to 10 −15 metres. In particle physics , this unit is sometimes called a fermi , also with abbreviation "fm". To help compare different orders of magnitude , this section lists lengths between 10 −15 meters and 10 −14 meters (1 femtometer and 10 fm).
However, most chemical literature traditionally uses mol/dm 3, which is the same as mol/L. This traditional unit is often called a molar and denoted by the letter M, for example: 1 mol/m 3 = 10 −3 mol/dm 3 = 10 −3 mol/L = 10 −3 M = 1 mM = 1 mmol/L. The SI prefix "mega" (symbol M) has the same symbol. However, the prefix is never used ...
A barn (symbol: b) is a metric unit of area equal to 10 −28 m 2 (100 fm 2).This is equivalent to a square that is 10 −14 m (10 fm) each side, or a circle of diameter approximately 1.128 × 10 −14 m (11.28 fm).
The first isotope to be discovered (in fallout from nuclear testing) was 255 Fm in 1952. 250 Fm was independently synthesized shortly after the discovery of 255 Fm. There are 20 known radioisotopes ranging in atomic mass from 241 Fm to 260 Fm (260 Fm is unconfirmed), and 4 nuclear isomers, 247m Fm, 250m Fm, 251m Fm, and 253m Fm.
1,1,1,2,3,3,3-Heptafluoropropane, also called heptafluoropropane, HFC-227ea (ISO name), HFC-227 or FM-200, as well as apaflurane , is a colourless, odourless gaseous halocarbon commonly used as a gaseous fire suppression agent.