Input interpretation
strontium (chemical element)
Periodic table location
Periodic table location
Image
Image
Basic elemental properties
![atomic symbol | Sr atomic number | 38 short electronic configuration | [Kr]5s^2 Aufbau diagram | 5s block | s group | 2 period | 5 atomic mass | 87.62 u (unified atomic mass units)](../image_source/3cc15824fafbcd17243c5177e7fe9103.png)
atomic symbol | Sr atomic number | 38 short electronic configuration | [Kr]5s^2 Aufbau diagram | 5s block | s group | 2 period | 5 atomic mass | 87.62 u (unified atomic mass units)
Thermodynamic properties
phase at STP | solid melting point | 777 °C (rank: 62nd) boiling point | 1382 °C (rank: 65th) molar heat of fusion | 8 kJ/mol (rank: 50th) molar heat of vaporization | 137 kJ/mol (rank: 63rd) specific heat at STP | 300 J/(kg K) (rank: 38th) (properties at standard conditions)
Material properties
density | 2.63 g/cm^3 (rank: 72nd) liquid density | 2.375 g/cm^3 molar volume | 33.32 cm^3/mol Mohs hardness | 1.5 (between talc and gypsum) shear modulus | 6.1 GPa Poisson ratio | 0.28 (rank: 27th) thermal expansion | 2.25×10^-5 K^(-1) (rank: 14th) thermal conductivity | 35 W/(m K) (rank: 41st) (properties at standard conditions)
Electromagnetic properties
electrical type | conductor resistivity | 1.3×10^-7 Ω m (ohm meters) electrical conductivity | 7.7×10^6 S/m (siemens per meter) magnetic type | paramagnetic volume magnetic susceptibility | 3.47×10^-6 mass magnetic susceptibility | 1.32×10^-9 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | 1.16×10^-10 m^3/mol (cubic meters per mole) work function | 2.59 eV (Polycrystalline) threshold frequency | 6.263×10^14 Hz (hertz) color | (silver)
Reactivity
valence | 2 electronegativity | 0.95 electron affinity | 5.03 kJ/mol (kilojoules per mole) first ionization energy | 549.5 kJ/mol (kilojoules per mole) ionization energies | 549.5 kJ/mol | 1064.2 kJ/mol | 4138 kJ/mol | 5500 kJ/mol | 6910 kJ/mol | 8760 kJ/mol | 10230 kJ/mol | 11800 kJ/mol | 15600 kJ/mol | 17100 kJ/mol
Reactivity
Atomic properties
term symbol | ^1S_0 atomic radius | 200 pm covalent radius | 195 pm (electronic ground state properties)
(neutral strontium atomic spectrum)
Abundances
universe abundance | 4×10^-6 mass% (rank: 30th) solar abundance | 5×10^-6 mass% (rank: 28th) meteorite abundance | 8.7×10^-4 mass% (rank: 26th) crust abundance | 0.036 mass% (rank: 16th) ocean abundance | 8.1×10^-4 mass% (rank: 10th) human abundance | 4.6×10^-4 mass% (rank: 16th) universe molar abundance | 6×10^-8 mol% (rank: 31st) solar molar abundance | 7×10^-8 mol% (rank: 29th) meteorite molar abundance | 2×10^-4 mol% (rank: 30th) ocean molar abundance | 5.7×10^-5 mol% (rank: 12th) crust molar abundance | 0.0085 mol% (rank: 17th) human molar abundance | 3.3×10^-5 mol% (rank: 18th)
Nuclear properties
half-life | (stable) stable isotopes | Sr-88 (82.58%) | Sr-86 (9.86%) | Sr-87 (7%) | Sr-84 (0.56%) nuclear spin | Sr-73: 1/2^- | Sr-74: 0^+ | Sr-75: 3/2^- | Sr-76: 0^+ | Sr-77: 5/2^+ | Sr-78: 0^+ | Sr-79: 3/2^- | Sr-80: 0^+ | Sr-81: 1/2^- | Sr-82: 0^+ | Sr-83: 7/2^+ | Sr-84: 0^+ | Sr-85: 9/2^+ | Sr-86: 0^+ | Sr-87: 9/2^+ | Sr-88: 0^+ | Sr-89: 5/2^+ | Sr-90: 0^+ | Sr-91: 5/2^+ | Sr-92: 0^+ | Sr-93: 5/2^+ | Sr-94: 0^+ | Sr-95: 1/2^+ | Sr-96: 0^+ | Sr-97: 1/2^+ | Sr-98: 0^+ | Sr-99: 3/2^+ | Sr-100: 0^+ | Sr-101: 5/2^- | Sr-102: 0^+ | Sr-104: 0^+ unstable isotopes | Sr-90 (28.9 yr) | Sr-85 (64.853 days) | Sr-89 (50.53 days) | Sr-82 (25.55 days) | Sr-83 (32.42 h) | Sr-91 (9.64 h) | Sr-92 (159.7 min) | Sr-80 (106.3 min) | Sr-81 (22.33 min) | Sr-93 (7.423 min) | Sr-78 (150 s) | Sr-79 (135 s) | Sr-94 (75.3 s) | Sr-95 (23.9 s) | Sr-77 (9 s) | Sr-76 (7.89 s) | Sr-96 (1.07 s) | Sr-98 (653 ms) | Sr-97 (429 ms) | Sr-99 (269 ms) | Sr-100 (202 ms) | Sr-101 (118 ms) | Sr-75 (88 ms) | Sr-102 (69 ms) | Sr-104 (30 ms) | Sr-73 (25 ms) | Sr-105 (20 ms) | Sr-74 (1.2 µs) | Sr-103 (150 ns) neutron cross-section | 1.2 b neutron mass absorption | 5×10^-4 m^2/kg
Identifiers
CAS number | 7440-24-6 PubChem CID number | 5359327