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With a density of 12 g/cm 3, americium is less dense than both curium (13.52 g/cm 3) and plutonium (19.8 g/cm 3); but has a higher density than europium (5.264 g/cm 3)—mostly because of its higher atomic mass. Americium is relatively soft and easily deformable and has a significantly lower bulk modulus than the actinides before it: Th, Pa, U ...
Americium-242m has a mass of 242.0595492 g/mol. It is one of the rare cases, like 108m Ag, 166m Ho, 180m Ta, 186m Re, 192m Ir, 210m Bi, 212m Po and others, where a higher-energy nuclear isomer is more stable than the ground state, americium-242. [11] 242m Am is fissile with a low critical mass, comparable to that of 239 Pu. [12]
{{Infobox element}}; labels & notes: (Image) GENERAL PROPERTIES Name Symbol Pronunciation (data central) Alternative name(s) Allotropes Appearance <element> IN THE PERIODIC TABLE Periodic table Atomic number Standard atomic weight (data central) Element category (also header bg color) (sets header bg color, over 'series='-color) Group Period ...
This is a list of chemical elements and their atomic properties, ordered by atomic number (Z). 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.
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 definitive visualisation of all 118 elements is the periodic table of the elements , whose history along the principles of the periodic law was one of the founding ...
The former first lady was notably absent from President Jimmy Carter's state funeral service, leading Barack Obama and Donald Trump to be seated next to one another
The first of these quantities is used in atomic physics, the second in chemistry, but both refer to the same basic property of the element. To convert from "value of ionization energy" to the corresponding "value of molar ionization energy", the conversion is: 1 eV = 96.48534 kJ/mol 1 kJ/mol = 0.0103642688 eV [12]
Americium-241 has a specific activity of 3.43 Ci/g (126.91 GBq/g). [3] It is commonly found in the form of americium-241 dioxide (241 AmO 2). This isotope also has one meta state, 241m Am, with an excitation energy of 2.2 MeV (0.35 pJ) and a half-life of 1.23 μs.