Technical data for Calcium

Overview Name Calcium Symbol Ca Atomic Number 20 Atomic Weight 40.078 Density 1.55 g/cc 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 8.54KJ/mol Heat of Vaporization 155.KJ/mol Heat of Combustion -990.J/(Kg K) Specific Heat 631.J/(Kg K)[note] Adiabatic Index N/A Neel Point N/A Thermal Conductivity 200.W/(m K) Thermal Expansion 0.0000223K-1 Bulk physical properties Density 1.55 g/cc Density (Liquid) 1.378 g/cc Molar Volume 0.000025857 Brinell Hardness 167.MPa Mohs Hardness 1.75MPa Vickers Hardness N/A Bulk Modulus 17.GPa Shear Modulus 7.4GPa 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 0.0000223K-1 Reactivity Valence 2 Electronegativity 1. ElectronAffinity 2.37KJ/mol Ionization Energies 589.8, 1145.4, 4912.4, 6491., 8153., 10496., 12270., 14206., 18191., 20385., 57110. KJ/mol Health and Safety Autoignition Point N/A Flashpoint N/A Heat of Combustion -990.J/(Kg K) DOT Hazard Class 4.2 DOT Numbers 1855 EU Number EU231-179-5 NFPA Fire Rating 1 NFPA Hazards Water Reactive NFPA Health Rating 3 NFPA Reactivity Rating 2 RTECS Classes N/A RTECS Number RTECSEW8040000 NFPA Label

Classifications Alternate Names None Names of Allotropes None Block s Group 2 Period 4 Electron Configuration [Ar]4s2 Color Silver Discovery 1808 in United Kingdom Gas phase N/A CAS Number 7440-70-2 CID Number CID271 Gmelin Number Gmelin16277 NSC Number N/A RTECS Number RTECSEW8040000 Electrical properties Electrical Type Conductor Electrical Conductivity 2.9×107S/m Resistivity 3.4×10-8m Ω Superconducting Point N/A Magnetic properties Magnetic Type Paramagnetic Curie Point N/A Mass Magnetic Susceptibility 1.38×10-8 Molar Magnetic Susceptibility 5.531×10-10 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 174.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%