Symbol: Sr Atomic Number: 38 Atomic Mass: 87.62 amu Melting Point: 769.0 °C (1042.15 K, 1416.2 °F) Boiling Point: 1384.0 °C (1657.15 K, 2523.2 °F) Number of Protons/Electrons: 38 Number of Neutrons: 50 Classification: Alkaline Earth Crystal Structure: Cubic Density @ 293 K: 2.54 g/cm 3 Color: yellowish Atomic Structure. Jul 03, 2019 Strontium is a yellowish-white alkaline earth metal with atomic number 38 and element symbol Sr. The element is known for producing red flames in fireworks and emergency flares and for its radioactive isotope that is found in nuclear fallout. Strontium S Element 38 Mass Number: 88 Atomic weight: 87.62 g/mol Atomic number (Z): 38 Electrons: 38 Protons: 38 Neutrons: 50 Period: 5 Group: 2 Block: s. Naturally occurring strontium is nonradioactive and nontoxic at levels normally found in the environment, but 90 Sr is a radiation hazard. 90 Sr undergoes β − decay with a half-life of 28.79 years and a decay energy of 0.546 MeV distributed to an electron, an antineutrino, and the yttrium isotope 90 Y, which in turn undergoes β − decay with a half-life of 64 hours and a. Atomic Number: 38: Atomic Radius: 249 pm (Van der Waals) Atomic Symbol: Sr: Melting Point: 777 °C: Atomic Weight: 87.62: Boiling Point: 1377 °C: Electron Configuration.
| Isotope | Atomic mass (Da) | Isotopic abundance (amount fraction) |
|---|---|---|
| 84Sr | 83.913 419(8) | 0.0056(2) |
| 86Sr | 85.909 260 73(4) | 0.0986(20) |
| 87Sr | 86.908 877 50(3) | 0.0700(20) |
| 88Sr | 87.905 612 26(4) | 0.8258(35) |
In its 1961 report, the Commission recommended Ar(Sr) = 87.62 based on the mass-spectrometricdetermination of Nier. This value was revised to Ar(Sr) = 87.62(1) in 1969 and it remains unchanged since.
Periodic Table
Known natural variations in the abundance of 87Sr, the product isotope of radioactive 87Rb decay, prevent the recommendationof a more precise standard atomic-weight value. The n(87Sr)/n(86Sr) ratio is a convenient measureof that variability. Anomalous traces of almost pure 87Sr have been reported from rubidium ores, for which the atomic weight willnot be in the tabulated standard atomic weight range.
The appreciable variability in n(87Sr)/n(86Sr) is the basis for Rb-Sr geochronology, and for analysisof source components in mixtures of water and geologic materials.
© IUPAC 2003
CIAAW
Strontium
Ar(Sr) = 87.62(1) since 1969
The name derives from Strontian, a town in Scotland. The mineral strontianite is found in mines inStrontian. The element was discovered in 1792 by the Scottish chemist and physician Thomas CharlesHope, who observed the brilliant red flame colour of strontium. It was first isolated by the Englishchemist Humphry Davy in 1808.
Isotopic reference materials of strontium.
Sr-90 Atomic Number
Atomic Number of Strontium is 38.
Chemical symbol for Strontium is Sr. Number of protons in Strontium is 38. Atomic weight of Strontium is 87.62 u or g/mol. Melting point of Strontium is 769 °C and its the boiling point is 1384 °C.
» Boiling Point» Melting Point» Abundant» State at STP» Discovery YearAbout Strontium
Strontium is an alkaline metal known for its extremely high chemical reactivity. It has got its name after a town in Scotland, Strontian. It occurs naturally on the surface of our planet in various minerals, and a large portion of natural strontium is produced in China. Since the properties of this chemical element are similar to the ones of calcium, there can be a bit of strontium accumulated in living organisms. When this chemical element burns, a salt of bright red color is produced, that’s why it is used for producing fireworks. Strontium is also used in chemical industry and for producing magnets. It is also a by-product of radioactive chemical reactions, and it can be dangerous and carcinogen for human body as a radioactive element.
Properties of Strontium Element
| Atomic Number (Z) | 38 |
|---|---|
| Atomic Symbol | Sr |
| Group | 2 |
| Period | 5 |
| Atomic Weight | 87.62 u |
| Density | 2.64 g/cm3 |
| Melting Point (K) | 1050 K |
| Melting Point (℃) | 769 °C |
| Boiling Point (K) | 1655 K |
| Boiling Point (℃) | 1384 °C |
| Heat Capacity | 0.301 J/g · K |
| Abundance | 370 mg/kg |
| State at STP | Solid |
| Occurrence | Primordial |
| Description | Alkaline earth metal |
| Electronegativity (Pauling) χ | 0.95 |
| Ionization Energy (eV) | 5.6949 |
| Atomic Radius | 200pm |
| Covalent Radius | 192pm |
| Valence Electrons | 2 |
| Year of Discovery | 1790 |
| Discoverer | Crawford |
Atomic Numbers Of Elements
What is the Boiling Point of Strontium?
Strontium boiling point is 1384 °C. Boiling point of Strontium in Kelvin is 1655 K.
What is the Melting Point of Strontium?
What Is Sr On The Periodic Table
Strontium melting point is 769 °C. Melting point of Strontium in Kelvin is 1050 K.
How Abundant is Strontium?
Abundant value of Strontium is 370 mg/kg.
Sr Mass And Atomic Number
What is the State of Strontium at Standard Temperature and Pressure (STP)?
Atomic Weight
State of Strontium is Solid at standard temperature and pressure at 0℃ and one atmosphere pressure.
When was Strontium Discovered?
Strontium was discovered in 1790.