Americium atomic mass oxidation number valence density boiling point melting point physical chemical properties the structure of the conductivity the conductivity of the crystal lattice

Americium, properties of atom, chemical and physical properties.

 

 

 

Am 95 Americium

243*** 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 7s2 5f7

 

Americium — element of the periodic system of chemical elements D. I. Mendeleev, with atomic number 95. Located in the 3rd group (old classification — side subgroup of the third group), the seventh period of the periodic system. Belongs to the group of actinides.

 

General information

Properties of an atom

Chemical properties

Physical properties

Table of chemical elements of D. I. Mendeleev

 


General information

 
Name Americium/ Americium
Symbol Am
Room at the table 95
Type Metal
Open E. M. McMillan and Phillip H. Abelson, USA, 1940
Appearance, etc. Silvery-white radioactive metal
The contents in the earth’s crust 0 %. Obtained by synthesis.
The contents in the ocean 0 %

Properties of an atom

 
The atomic mass (molar mass)*** 243 and. E. M. (g/mol)
Electronic configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 7s2 5f7
The radius of the atom 173 PM

Chemical properties

 
Oxidation +6, +5, +4, +3, +2
Valence +3, +4
Covalent radius 180±6 PM
The radius of the ion (+4e) 92 (+3e) 107 PM
Radius van der Waals
Electronegativity Of 1.3 (scale Pauling)
Energy of ionization (the first electron) 578 kJ/mol (6.0 eV)
Electrode potential -0,90 V, -2,07 V, -1,95 IN

Physical properties

Density (under normal conditions) 13,67 g/cm3
Melting point 1176 °C (1449 K)
Boiling point 2607 °C (2880 K)
UD. the heat of fusion Of 14.39 kJ/mol
UD. heat of evaporation 238,5 kJ/mol
Molar heat capacity 25,85 j/(K·mol)
Molar volume 20,8 cm3/mol
The thermal conductivity (at 300 K) 10 W/(m·K)
The electrical conductivity in the solid phase
Superconductivity at a temperature of
Hardness
The lattice structure hexagonal
The lattice parameters a = 3,468 Å, c = Å 11,24
Debye Temperature

 

Note:

*** The value is the atomic mass for stable isotope.

 

Table of chemical elements of D. I. Mendeleev