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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 (103 Lr) is a synthetic element, and thus a standard atomic weight cannot be given. Like all synthetic elements, it has no stable isotopes. The first isotope to be synthesized was 258 Lr in 1961. There are fourteen known isotopes from 251 Lr to 266 Lr, except 263 Lr and 265 Lr, and seven isomers.
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.
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]
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Superheavy elements, also known as transactinide elements, transactinides, or super-heavy elements, or superheavies for short, are the chemical elements with atomic number greater than 104. [1] The superheavy elements are those beyond the actinides in the periodic table; the last actinide is lawrencium (atomic number 103).
This is a list of chemical elements and their atomic properties, ordered by atomic number (Z).. Since valence electrons are not clearly defined for the d-block and f-block elements, there not being a clear point at which further ionisation becomes unprofitable, a purely formal definition as number of electrons in the outermost shell has been used.
A period 2 element is one of the chemical elements in the second row (or period) of the periodic table of the chemical elements.The periodic table is laid out in rows to illustrate recurring (periodic) trends in the chemical behavior of the elements as their atomic number increases; a new row is started when chemical behavior begins to repeat, creating columns of elements with similar properties.