Element Strontium

Strontium ElementIt is an element with atomic symbol Sr, atomic number 38, and atomic weight 87.62.
Strontium atom is an alkaline earth metal atom.
Element Strontium is a naturally occurring element found in rocks, soil, dust, coal, and oil. Naturally occurring strontium is not radioactive and is either referred to as stable strontium or strontium.
Element Strontium in the environment exists in four stable isotopes, 84Sr (read as strontium eighty-four), 86Sr, 87Sr, 88Sr. Strontium compounds are used in making ceramics and glass products, pyrotechnics, paint pigments, fluorescent lights, and medicines.
Strontium can also exist as several radioactive isotopes; the most common is 90Sr. 90Sr is formed in nuclear reactors or during the explosion of nuclear weapons.
Radioactive strontium generates beta particles as it decays. One of the radioactive properties of strontium is half-life, or the time it takes for half of the isotope to give off its radiation and change into another substance. The half-life of 90Sr is 29 years.

Names and Identifiers

Chemical Formula:Sr
CAS:7440-24-6
Molecular Weight:87.620g/mol
EC Number :231-133-4
MDL Number:MFCD00134060
Color:silvery white
Other Names:Stronzio, Estrôncio
PubChem CID:5359327
IUPAC Name:Strontium
Inchl:InChI=1S/Sr
InChI Key:CIOAGBVUUVVLOB-UHFFFAOYSA-N
Canonical SMILES:[Sr]
ICSC Number:1534

Physical & Chemical Properties

Phase:Solid
Density:2.64 g/cm³
Boiling Point:1650 K ​(1377 °C, ​2511 °F)
Melting Point:1050 K ​(777 °C, ​1431 °F)
Molecular Formula:Sr
Flash Point:n/a
Exact Mass:87.905617
Symbol:Globally Harmonized System of ClassificationGlobally Harmonized System of Classification
Signal Word:Danger
Hazard Statements:H260-H315
Precautionary Statements:P223-P231 + P232-P370 + P378-P422
Hazard Codes:F: Flammable;Xi: Irritant;T: Toxic;
Risk Phrases:R37/38
Safety Phrases:S26-S45-S36/37/39-S27-S23
RIDADR:UN 3264 8/PG 3
WGK Germany:3
RTECS:WK8400000
Packaging Group:II
Hazard Class:4.3

Natural strontium is a mixture of four stable isotopes: 84Sr, 86Sr, 87Sr, and 88Sr.
Their abundance increases with increasing mass number and the heaviest, 88Sr, makes up about 82.6% of all natural strontium, though the abundance varies due to the production of radiogenic 87Sr as the daughter of long-lived beta-decaying 87Rb

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
84Sr83.913430 (4)0.56 (1)0
86Sr85.9092672 (28)9.86 (1)0
87Sr86.9088841 (28)7.00 (1)9/2-1.09283
88Sr87.9056188 (28)82.58 (1)0

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
80Sr79.924531.77 hEC to 80Rb0
81Sr80.9232222.3 mEC to 81Rb1/20.544
82Sr81.9184025.36 dEC to 82Rb1/2
83Sr82.917561.350 dEC to 83Rb7/2-0.898
85Sr84.91293664.85 dEC to 85Rb9/2-1.001
89Sr88.90745550.52 dβ to 89Y5/2-1.149
90Sr89.90773829.1 yβ to 90Y0
91Sr90.910209.5 hβ to 91Y5/2-0.887
92Sr91.910982.71 hβ to 92Y0

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