properties of barium

barium (chemical element)

Periodic table location

Image

atomic symbol | Ba atomic number | 56 short electronic configuration | [Xe]6s^2 Aufbau diagram | 6s block | s group | 2 period | 6 atomic mass | 137.327 u (unified atomic mass units)

phase at STP | solid melting point | 727 °C (rank: 63rd) boiling point | 1870 °C (rank: 56th) molar heat of fusion | 8 kJ/mol (rank: 53rd) molar heat of vaporization | 140 kJ/mol (rank: 62nd) specific heat at STP | 205 J/(kg K) (rank: 54th) (properties at standard conditions)

density | 3.51 g/cm^3 (rank: 68th) liquid density | 3.338 g/cm^3 molar volume | 39.12 cm^3/mol Mohs hardness | 1.25 (between talc and gypsum) bulk modulus | 9.6 GPa (rank: 59th) shear modulus | 4.9 GPa Young's modulus | 13 GPa (rank: 55th) sound speed | 1620 m/s (rank: 57th) thermal expansion | 2.06×10^-5 K^(-1) (rank: 18th) thermal conductivity | 18 W/(m K) (rank: 52nd) (properties at standard conditions)

electrical type | conductor resistivity | 3.5×10^-7 Ω m (ohm meters) electrical conductivity | 2.9×10^6 S/m (siemens per meter) magnetic type | paramagnetic volume magnetic susceptibility | 3.966×10^-5 mass magnetic susceptibility | 1.13×10^-8 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | 1.552×10^-9 m^3/mol (cubic meters per mole) work function | 2.52 eV (Polycrystalline) threshold frequency | 6.093×10^14 Hz (hertz) color | (silver)

valence | 2 electronegativity | 0.89 electron affinity | 13.95 kJ/mol (kilojoules per mole) first ionization energy | 502.9 kJ/mol (kilojoules per mole) ionization energies | 502.9 kJ/mol | 965.2 kJ/mol | 3600 kJ/mol

Reactivity

term symbol | ^1S_0 atomic radius | 215 pm covalent radius | 215 pm (electronic ground state properties)

(neutral barium atomic spectrum)

universe abundance | 1×10^-6 mass% (rank: 33rd) solar abundance | 1×10^-6 mass% (rank: 34th) meteorite abundance | 2.7×10^-4 mass% (rank: 31st) crust abundance | 0.034 mass% (rank: 17th) ocean abundance | 3×10^-6 mass% (rank: 21st) human abundance | 3×10^-5 mass% (rank: 24th) universe molar abundance | 9×10^-9 mol% (rank: 42nd) solar molar abundance | 9.9×10^-9 mol% (rank: 35th) meteorite molar abundance | 4.1×10^-5 mol% (rank: 35th) ocean molar abundance | 1.4×10^-7 mol% (rank: 32nd) crust molar abundance | 0.0051 mol% (rank: 20th) human molar abundance | 1.4×10^-6 mol% (rank: 27th)

half-life | (stable) stable isotopes | Ba-138 (71.698%) | Ba-137 (11.232%) | Ba-136 (7.854%) | Ba-135 (6.592%) | Ba-134 (2.417%) | Ba-130 (0.106%) | Ba-132 (0.101%) nuclear spin | Ba-114: 0^+ | Ba-115: 5/2^+ | Ba-116: 0^+ | Ba-117: 3/2^+ | Ba-118: 0^+ | Ba-119: 5/2^+ | Ba-120: 0^+ | Ba-121: 5/2^+ | Ba-122: 0^+ | Ba-123: 5/2^+ | Ba-124: 0^+ | Ba-125: 1/2^+ | Ba-126: 0^+ | Ba-127: 1/2^+ | Ba-128: 0^+ | Ba-129: 1/2^+ | Ba-130: 0^+ | Ba-131: 1/2^+ | Ba-132: 0^+ | Ba-133: 1/2^+ | Ba-134: 0^+ | Ba-135: 3/2^+ | Ba-136: 0^+ | Ba-137: 3/2^+ | Ba-138: 0^+ | Ba-139: 7/2^- | Ba-140: 0^+ | Ba-141: 3/2^- | Ba-142: 0^+ | Ba-143: 5/2^- | Ba-144: 0^+ | Ba-145: 5/2^- | Ba-146: 0^+ | Ba-147: 3/2^+ | Ba-148: 0^+ | Ba-149: 3/2^- | Ba-150: 0^+ | Ba-151: 3/2^- | Ba-152: 0^+ | Ba-153: 5/2^- unstable isotopes | Ba-133 (10.52 yr) | Ba-140 (12.752 days) | Ba-131 (11.5 days) | Ba-128 (58 h) | Ba-129 (133.8 min) | Ba-126 (100 min) | Ba-139 (83.06 min) | Ba-141 (18.27 min) | Ba-127 (12.7 min) | Ba-124 (11 min) | Ba-142 (10.6 min) | Ba-125 (210 s) | Ba-123 (160 s) | Ba-122 (117 s) | Ba-121 (29.7 s) | Ba-120 (24 s) | Ba-143 (14.5 s) | Ba-144 (11.5 s) | Ba-119 (5.4 s) | Ba-118 (5.5 s) | Ba-145 (4.31 s) | Ba-146 (2.22 s) | Ba-117 (1.75 s) | Ba-116 (1.3 s) | Ba-147 (893 ms) | Ba-148 (612 ms) | Ba-115 (450 ms) | Ba-114 (430 ms) | Ba-149 (344 ms) | Ba-150 (300 ms) | Ba-152 (100 ms) | Ba-153 (80 ms) | Ba-151 (300 ns) neutron cross-section | 1.3 b neutron mass absorption | 2.7×10^-4 m^2/kg

CAS number | 7440-39-3 PubChem CID number | 5355457