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Lawrencium is a synthetic chemical element; it has symbol Lr (formerly Lw) and atomic number 103. It is named after Ernest Lawrence, inventor of the cyclotron, a device that was used to discover many artificial radioactive elements.
(Lawrencium, the first 6d element, is sometimes but not always included as well.) They have only been made artificially and currently serve no practical purpose because their short half-lives cause them to decay after a very short time, ranging from a few hours to just milliseconds, which also makes them extremely hard to study.
Except for rutherfordium and dubnium (and lawrencium if it is included), even the longest-lived known isotopes of superheavies have half-lives of minutes or less. The element naming controversy involved elements 102–109. Some of these elements thus used systematic names for many years after their discovery was confirmed. (Usually the ...
Very little is known about lawrencium, but calculations suggest it continues the trend of its lighter congeners toward increasing density. [62] [63] Scandium, yttrium, and lutetium all crystallize in the hexagonal close-packed structure at room temperature, [64] and lawrencium is expected to do the same. [65]
Lawrencium: Rutherfordium: ... because the mass of an alpha particle per nucleon is small enough to leave some energy for the alpha particle to be used as ...
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Ringer's lactate solution (RL), also known as sodium lactate solution, Lactated Ringer's (LR), and Hartmann's solution, is a mixture of sodium chloride, sodium lactate, potassium chloride, and calcium chloride in water. [1] It is used for replacing fluids and electrolytes in those who have low blood volume or low blood pressure. [2]
The chemical properties of nobelium and lawrencium were studied with 255 No (t 1/2 = 3 min) and 256 Lr (t 1/2 = 35 s). The longest-lived nobelium isotope, 259 No, has a half-life of approximately 1 hour. [57] Lawrencium has 14 known isotopes with mass numbers 251–262, 264, and 266. The most stable of them is 266 Lr with a half life of 11 hours.