[Latest] How old is Calcium now?

Living Person

Calcium
is

As of April 15, 2026

218 years old
approximately!

* Calculated from Wikipedia data.
Accuracy is not guaranteed.

Calcium, ₂₀Ca

Calcium
Appearance	dull gray, silver; with a pale yellow tint
Standard atomic weight Ar°(Ca)
	40.078±0.004 40.078±0.004 (abridged)
Calcium in the periodic table
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Mg ↑ Ca ↓ Sr potassium ← calcium → scandium
Atomic number (Z)	20
Group	group 2 (alkaline earth metals)
Period	period 4
Block	s-block
Electron configuration	[Ar] 4s
Electrons per shell	2, 8, 8, 2
Physical properties
Phase at STP	solid
Melting point	1115 K ​(842 °C, ​1548 °F)
Boiling point	1757 K ​(1484 °C, ​2703 °F)
Density (at 20° C)	1.526 g/cm
when liquid (at m.p.)	1.378 g/cm
Heat of fusion	8.54 kJ/mol
Heat of vaporisation	154.7 kJ/mol
Molar heat capacity	25.929 J/(mol·K)
Specific heat capacity	646.963 J/(kg·K)
Vapour pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 864 956 1071 1227 1443 1755
Atomic properties
Oxidation states	common: +2 +1
Electronegativity	Pauling scale: 1.00
Ionisation energies	1st: 589.8 kJ/mol 2nd: 1145.4 kJ/mol 3rd: 4912.4 kJ/mol (more)
Atomic radius	empirical: 197 pm
Covalent radius	176±10 pm
Van der Waals radius	231 pm
Spectral lines of calcium
Other properties
Natural occurrence	primordial
Crystal structure	​face-centred cubic (fcc) (cF4)
Lattice constant	a = 558.8 pm (at 20 °C)
Thermal expansion	22.27×10/K (at 20 °C)
Thermal conductivity	201 W/(m⋅K)
Electrical resistivity	33.6 nΩ⋅m (at 20 °C)
Magnetic ordering	diamagnetic
Molar magnetic susceptibility	+40.0×10 cm/mol
Young's modulus	20 GPa
Shear modulus	7.4 GPa
Bulk modulus	17 GPa
Speed of sound thin rod	3810 m/s (at 20 °C)
Poisson ratio	0.31
Mohs hardness	1.75
Brinell hardness	170–416 MPa
CAS Number	7440-70-2
History
Naming	from the Latin word for lime, calx
Discovery and first isolation	Humphry Davy (1808)
Isotopes of calcium v e
Main isotopes Decay Isotope abun­dance half-life (t1/2) mode pro­duct Ca 96.9% stable Ca trace 9.94×10 y ε K Ca 0.647% stable Ca 0.135% stable Ca 2.09% stable Ca synth 162.61 d β Sc Ca 0.004% stable Ca synth 4.536 d β Sc Ca 0.187% 5.6×10 y ββ Ti
Category: Calcium view talk edit | references

Wikipedia Categories

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• Reducing agents
• Dietary minerals
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