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Home > Americium

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plutonium – americium – curium
Eu

Am
   
 
 

General
Name, Symbol, Number americium, Am, 95
Chemical series actinides
Group, Period, Block 7, f
Appearance silvery white
Atomic properties
Atomic weightIn reference to a certain isotope of a chemical element, atomic weight (more accurately relative atomic mass though also called simply atomic mass is the mass of one atom of the isotope expressed in units atomic mass unit amu) such that the Carbon-12 isot [243] amu]]
Atomic radiusAtomic radius is the distance from the atomic nucleus to the outmost stable electron orbital in a atom that is at equilibrium and is measured in picometers or Angstroms. Atomic radii are called covalent radii (a reference to the types of bonds formed) whe (calc.) 175 pm (no data)To help compare different orders of magnitude this page lists lengths between 100 pm and 1 nm (10-10 m and 10-9 m). See also lengths of other orders of magnitude. Lengths shorter than 100 pm 100 pm 1 Angstrom 100 pm (0. 1 nm) covalent radius of sulfur ato
Covalent radiusCovalent radius in chemistry corresponds to half of the distance between two identical atomic nuclei, bound by a covalent bond. It is expressed in terms of pm or A. Chemistry. no data
van der Waals radiusThe van der Waals radius of an atom is the radius of an imaginary hard sphere which can be used to model the atom for many purposes. Van der Waals radii are determined from measurements of atomic spacing between pairs of unbonded atoms in crystals. The va no data
Electron configurationElectron configuration is the arrangement of electrons in an atom, molecule or other body. Specifically, it is the placement of electrons into atomic, molecular, or other forms of electron orbitals. Orbitals, states, and wavefunctions Since electrons are [ RnAstatine Radon Xe Rn Uuo Full table General Name, Symbol, NumberRadon, Rn, 86 Chemical series Noble gases Group, Period, Block 18 (VIIIA), 6 , p Density, Hardness 9. 73 kg/m3 (273 K), NA Appearance colorless Atomic properties Atomic weight [222] amu Atomi]5f7 7 s2
e- 's per energy level 2,8,18,32,25,8,2
Oxidation states ( Oxide) 6,5,4,3 ( amphoteric)
Physical properties
Density 13700 kg/m3
State of matter solid
Melting point 1449 K (2149 °F)
Boiling point 2880 K (4725 °F)
Crystal structure hexagonal
Hardness no data
Magnetic ordering no data
Molar volume 17.63 ×10-6 m3/mol
Heat of vaporization no data
Heat of fusion 14

.4 kJ/mol

Vapor pressure no data
Velocity of sound no data
Miscellaneous
Electronegativity 1.3 ( Pauling scale)
Specific heat capacity no data
Electrical conductivity 2.2 106/m ohm
Thermal conductivity 10 W/(m*K)
1st ionization potential 578 kJ/mol
Most stable isotopes
iso NA half-life DM DE M eV DP
241Am {syn.} 432.2 y SF
α 		 
5.638 		 
237 Np
242mAm {syn.} 141 y IT
α
SF 		0.049
5.637
  		 
238Np
 
243Am {syn.} 7370 y SF
α 		 
5.438 		 
239Np
SI units & STP are used except where noted.

Americium is a synthetic element in the periodic table that has the symbol Am and atomic number 95. A radioactive metallic element, americium is an actinide that was obtained by bombarding plutonium with neutrons and was the fourth transuranic element to be discovered. It was named for the Americas, by analogy with europium.



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Americium Am-241 Element Isotopes Neutron Years

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AmericiumAmericium is a synthetic element in the periodic table that has the symbol Am and atomic number 95. A radioactive metallic element, americium is an actinide that was obtained by bombarding plutonium with neutrons and was the fourth transuranic element to  


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