Lawrencium
Lawrencium is a chemical element. Before being officially named, it was known as eka-lutetium and unniltrium. It has the symbol Lr. It has the atomic number 103. It is a group 3 element and transition metal, but is also often counted as an actinide.[1]
It is a radioactive element that does not exist in nature. It has to be made. Lawrencium is made from californium. The isotope that has the longest half-life (262Lr) has a half life of about 3.6 hours.
No uses for lawrencium are known. What lawrencium looks like is not known because not enough has been made to see it with human eyesight.
Discovered by Albert Ghiorso and co-workers in 1961, in California. Named after Ernest O. Lawrence, inventor of the cyclotron, a research instrument with which several new elements have been found/made.
Lawrencium Media
Albert Ghiorso updating the periodic table in April 1961, writing the symbol "Lw" in as element 103. Codiscoverers Latimer, Sikkeland, and Larsh (left to right) look on.
Elution sequence of the late trivalent lanthanides and actinides, with ammonium α-HIB as eluant: the broken curve for lawrencium is a prediction.
First ionization energy (eV) plotted against atomic number, in units eV. Predicted values are used beyond rutherfordium (element 104). Lawrencium (element 103) has a very low first ionization energy, fitting the start of the d-block trend better than the end of the f-block trend before it.
Related pages
References
- ↑ Scerri, Eric (2021). "Provisional Report on Discussions on Group 3 of the Periodic Table". Chemistry International. 43: 31–34. doi:10.1515/ci-2021-0115.
