Barium

Latin nameBaryum
English nameBarium
chemical symbolBa
atomic number56
relative atomic mass137,327
period6
groupII.A
classificationalkaline earth metals
discovery year1808
discovererH.Davy
melting point [°C]725
boiling point [°C]1897
density [g cm-3]3,51
density at melting point [g cm-3]3,338
electronegativity [Pauling]0,89
stand. el. potential [V]−2,912
oxidation statesII
electron configuration[Xe] 6s2
specific heat [J g-1K-1]0,204
heat of fusion [kJ mol-1]7,75
thermal conductivity [W m-1 K-1]18,4
el. conductivity [S m-1]2,8.106
1. ionizing potential [eV]5,2117
2. ionizing potential [eV]10,004
Mohs hardness1,25
shear modulus [GPa]4,9
Young's modulus [GPa]13
state at normal conditionssolid

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