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General
Name, Symbol, Number Strontium, Sr, 38
Series Alkaline earth metal
Group, Period, Block 2 (IIA), 5, sAn atomic orbital is the mode of behavior of an electron in an atom (see first Electron orbital). A given orbital is identified by unique values of three quantum numbers: , , and. The various types of orbitals An orbital is uniquely identified by the valu
DensityFor other meanings of density, see density (disambiguation Density (symbol: rho Greek: rho) is a measure of mass per unit of volume. The higher an object's density, the higher its mass per volume. The average density of an object equals its total mass div, Hardness 2630 kg/m3Kilogram per cubic metre is the SI measure of density and is represented as kg/m³, where kg stands for kilogram and m³ stands for cubic metre. The density of water is about 1000 kg/m³, since a cubic metre of water weighs about a tonne. kg/m³" is sometimes, 1.5
AppearanceFor alternative meanings, see color (disambiguation). visual arts. Color (or colour is a sensation which (in humans) derives from the ability of the fine structure of the eye to distinguish three differently filtered analyses of a view. The perception of silvery white metallic
Atomic properties
Atomic weightIn reference to a certain isotope of a chemical element, atomic weight (more accurately relative atomic mass though also called simply atomic mass is the mass of one atom of the isotope expressed in units atomic mass unit amu) such that the Carbon-12 isot 87.62 amuThe atomic mass unit amu , unified atomic mass unit u , or dalton Da , is a small unit of mass used to express atomic masses and molecular masses. It is defined to be 1/12 of the mass of one atom of Carbon-12. Accordingly, :1 u 1/N gram 1/(1000 N) kg (whe
Atomic radiusAtomic radius is the distance from the atomic nucleus to the outmost stable electron orbital in a atom that is at equilibrium and is measured in picometers or Angstroms. Atomic radii are called covalent radii (a reference to the types of bonds formed) whe 215.1 pm
Covalent radius 192 pm
van der Waals radius no information
Electron configuration [ Kr]5s2
e- 's per energy level 2, 8, 18, 8, 2
Oxidation states ( Oxide) 2 (strong base)
Crystal structure Cubic face centered
Physical properties
State of matter solid ( paramagnetic)
Melting point 1050 K (1431 ° F)
Boiling point 1655 K (2520 °F)
Molar volume 33.94 ×10-6 m3/mol
Heat of vaporization 144 kJ/mol
Heat of fusion 8.3 kJ/mol
Vapor pressure 246 Pa at 1042 K
Speed of sound data not available
Miscellaneous
Electronegativity 0.95 ( Pauling scale)
Specific heat capacity 300 J/(kg*K)
Electrical conductivity 7.62 106/(m· ohm)
Thermal conductivity 35.3 W/(m*K)
1st ionization potential 549.5 kJ/mol
2nd ionization potential 1064.2 kJ/mol
3rd ionization potential 4138 kJ/mol
Most stable isotopes
iso NA half-life DM DE M eV DP
84Sr 0.56% Sr is stable with 46 neutrons
86Sr 9.86% Sr is stable with 48 neutrons
87Sr 7.0% Sr is stable with 49 neutrons
88Sr 82.58% Sr is stable with 50 neutrons
90Sr {syn.} 28.78 y beta- 0.546 90Y
SI units & STP are used except where noted.

Strontium is a chemical element in the periodic table that has the symbol Sr and the atomic number 38. An alkaline earth metal, strontium is a soft silver-white or yellowish metallic element that is highly reactive chemically. This metal turns yellow when exposed to air and occurs in celestite and strontianite. Sr-90 is present in radioactive fallout and has a half-life of 28 years.





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