22537-19-5 Usage
Description
Lawrencium, a synthetic chemical element with the symbol Lr and atomic number 103, is a member of the actinide series. It has two isotopes, 257 and 256, with 257Lr having a half-life of 8 seconds. Lawrencium was discovered in 1961 by Ghioros and colleagues at the Lawrence Berkeley Laboratory and can be synthesized by bombarding californium with boron ions.
Uses
1. Used in Scientific Research:
Lawrencium is used as a research element for studying its chemical and physical properties, as well as its potential applications in various fields. Its unique properties and short half-life make it an interesting subject for scientists to explore.
2. Used in Nuclear Physics:
As a synthetic element, Lawrencium plays a role in nuclear physics, particularly in understanding the behavior of heavy elements and their isotopes. Its short half-life and the ability to synthesize it through bombardment of californium with boron ions contribute to the study of nuclear reactions and decay processes.
3. Used in Material Science:
Although its practical applications are limited due to its short half-life and scarcity, Lawrencium may be used as a material in the future if more stable isotopes or methods to prolong its half-life are discovered. This could potentially lead to advancements in material science and technology.
4. Used in Educational Purposes:
Lawrencium serves as an educational tool for teaching students about the periodic table, the actinide series, and the process of element discovery and synthesis. Its unique properties and history can help students understand the importance of scientific research and the role of collaboration in scientific advancements.
History
Lawrencium was synthesized by Ghiorso, Sikkeland, Larsh and Latimer in 1961 in Lawrence Radiation Laboratory, Berkeley, California. The new element was named after Ernest O. Lawrence. The element has no practical application.
History
The original chemical symbol was proposed as Lw but it was changed because “W” is an unusual occurrence in many languages and it is a cumbersome spoken word. The name derives from Ernest 0. Lawrence American physicist, winner of the 1939 Nobel Prize for Physics for is invention of the cyclotron. Credit for the first synthesis of this element in 1961 is given jointly to American chemists from the University of California laboratory in Berkeley, California Albert Ghiorso, Torbjorn Sikkeland, Almon Larsh, Robert M. Latimer and the Russian scientific team at the JINR (Joint Institute for Nuclear Reactions) lab in Dubna, Russia under Georgi N. Flerov, after a series of preliminary papers presented over a decade. The longest half-life associated with this unstable element is 3.6 hour 262Lr.
Synthesis
Lawrencium has been synthesized only in very minute quantities. It was first synthesized by irradiating a mixture of californium isotopes with boron ions:
The isotope obtained this way has a half-life of about 4.2 seconds and is an alpha emitter.
Lawrencium-256 ( ~35 seconds) is prepared by bombarding americium-243 with oxygen-18:
All lawrencium isotopes of masses 255 to 260 have been synthesized by bombardment of transuranium elements with heavy ions.
Check Digit Verification of cas no
The CAS Registry Mumber 22537-19-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,2,5,3 and 7 respectively; the second part has 2 digits, 1 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 22537-19:
(7*2)+(6*2)+(5*5)+(4*3)+(3*7)+(2*1)+(1*9)=95
95 % 10 = 5
So 22537-19-5 is a valid CAS Registry Number.
InChI:InChI=1/Lr
