[Latest] How old is Strontium now?

Living Person

Strontium
is

As of April 16, 2026

236 years old
approximately!

* Calculated from Wikipedia data.
Accuracy is not guaranteed.

Strontium, ₃₈Sr

Strontium
Pronunciation	/ˈstrɒntiəm/ (STRON-tee-əm) /ˈstrɒnʃiəm/ (STRON-shee-əm)
Appearance	silvery white metallic; with a pale yellow tint
Standard atomic weight Ar°(Sr)
	87.62±0.01 87.62±0.01 (abridged)
Strontium 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 Ca ↑ Sr ↓ Ba rubidium ← strontium → yttrium
Atomic number (Z)	38
Group	group 2 (alkaline earth metals)
Period	period 5
Block	s-block
Electron configuration	[Kr] 5s
Electrons per shell	2, 8, 18, 8, 2
Physical properties
Phase at STP	solid
Melting point	1050 K ​(777 °C, ​1431 °F)
Boiling point	1650 K ​(1377 °C, ​2511 °F)
Density (at 20° C)	2.582 g/cm
when liquid (at m.p.)	2.375 g/cm
Heat of fusion	7.43 kJ/mol
Heat of vaporization	141 kJ/mol
Molar heat capacity	26.4 J/(mol·K)
Specific heat capacity	301.301 J/(kg·K)
Vapor pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 796 882 990 1139 1345 1646
Atomic properties
Oxidation states	common: +2 +1
Electronegativity	Pauling scale: 0.95
Ionization energies	1st: 549.5 kJ/mol 2nd: 1064.2 kJ/mol 3rd: 4138 kJ/mol
Atomic radius	empirical: 215 pm
Covalent radius	195±10 pm
Van der Waals radius	249 pm
Spectral lines of strontium
Other properties
Natural occurrence	primordial
Crystal structure	​face-centered cubic (fcc) (cF4)
Lattice constant	a = 608.6 pm (at 20 °C)
Thermal expansion	22.55×10/K (at 20 °C)
Thermal conductivity	35.4 W/(m⋅K)
Electrical resistivity	132 nΩ⋅m (at 20 °C)
Magnetic ordering	paramagnetic
Molar magnetic susceptibility	−92.0×10 cm/mol (298 K)
Young's modulus	15.7 GPa
Shear modulus	6.03 GPa
Poisson ratio	0.28
Mohs hardness	1.5
CAS Number	7440-24-6
History
Naming	after the mineral strontianite, itself named after Strontian, Scotland
Discovery	William Cruickshank (1787)
First isolation	Humphry Davy (1808)
Isotopes of strontium v e
Main isotopes Decay Isotope abun­dance half-life (t1/2) mode pro­duct Sr synth 25.35 d ε Rb Sr synth 32.41 h β Rb Sr 0.56% stable Sr synth 64.846 d ε Rb Sr 9.86% stable Sr 7% stable Sr 82.6% stable Sr synth 50.56 d β Y Sr trace 28.91 y β Y
Category: Strontium view talk edit | references

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