Technical data for Calcium

Overview Name Calcium Symbol Ca Atomic Number 20 Atomic Weight 40.078 Density 1.55 g/cm3 Melting Point 842 °C Boiling Point 1484 °C Thermal properties Phase Solid Melting Point 842 °C Boiling Point 1484 °C Absolute Melting Point 1115 K Absolute Boiling Point 1757 K Critical Pressure N/A Critical Temperature N/A Heat of Fusion 8.54 kJ/mol Heat of Vaporization 155 kJ/mol Specific Heat 631 J/(kg K)[note] Adiabatic Index N/A Neel Point N/A Thermal Conductivity 200 W/(m K) Thermal Expansion 0.0000223 K-1 Bulk physical properties Density 1.55 g/cm3 Density (Liquid) 1.378 g/cm3 Molar Volume 0.000025857 Brinell Hardness 167 MPa Mohs Hardness 1.75 Vickers Hardness N/A Bulk Modulus 17 GPa Shear Modulus 7.4 GPa Young Modulus 20 GPa Poisson Ratio 0.31 Refractive Index N/A Speed of Sound 3810 m/s Thermal Conductivity 200 W/(m K) Thermal Expansion 0.0000223 K-1 Reactivity Valence 2 Electronegativity 1 ElectronAffinity 2.37 kJ/mol Ionization Energies 589.8, 1145.4, 4912.4, 6491, 8153, 10496, 12270, 14206, 18191, 20385, 57110 kJ/mol Health and Safety DOT Hazard Class 4.2 DOT Numbers 1855 RTECS Number N/A NFPA Label

Classifications Alternate Names None Names of Allotropes None Block s Group 2 Period 4 Series Alkaline Earth Metal Electron Configuration [Ar]4s2 Color Silver Discovery 1808 in The United Kingdom Gas phase N/A CAS Number CAS7440-70-2 CID Number CID5460341 RTECS Number N/A Electrical properties Electrical Type Conductor Electrical Conductivity 2.9×107 S/m Resistivity 3.399999999999×10-8 m Ω Superconducting Point N/A Magnetic properties Magnetic Type Paramagnetic Curie Point N/A Mass Magnetic Susceptibility 1.38×10-8 m3/Kg Molar Magnetic Susceptibility 5.531×10-10 m3/mol Volume Magnetic Susceptibility 0.00002139 Abundances % in Universe 0.007% % in Sun 0.007% % in Meteorites 1.1% % in Earth's Crust 5% % in Oceans 0.00042% % in Humans 1.4% Atomic dimensions and structure Atomic Radius 194 pm Covalent Radius 176 pm Van der Waals Radius N/A Crystal Structure Face-centered Cubic Lattice Angles π/2, π/2, π/2 Lattice Constants 558.84, 558.84, 558.84 pm Space Group Name Fm_ 3m Space Group Number 225 Nuclear Properties Half-Life Stable Lifetime Stable Decay Mode N/A Quantum Numbers 1S0 Neutron Cross Section 0.43 Neutron Mass Absorption 0.00037 Known Isotopes 34Ca, 35Ca, 36Ca, 37Ca, 38Ca, 39Ca, 40Ca, 41Ca, 42Ca, 43Ca, 44Ca, 45Ca, 46Ca, 47Ca, 48Ca, 49Ca, 50Ca, 51Ca, 52Ca, 53Ca, 54Ca, 55Ca, 56Ca, 57Ca Stable Isotopes 40Ca, 42Ca, 43Ca, 44Ca, 46Ca Isotopic Abundances 40Ca 96.941% 42Ca 0.647% 43Ca 0.135% 44Ca 2.086% 46Ca 0.004% 48Ca 0.187%