{"id":223,"date":"2020-04-09T10:05:57","date_gmt":"2020-04-09T10:05:57","guid":{"rendered":"https:\/\/thechemicalelements.com\/?page_id=223"},"modified":"2023-08-15T14:55:51","modified_gmt":"2023-08-15T14:55:51","slug":"lawrencium","status":"publish","type":"post","link":"https:\/\/thechemicalelements.com\/lawrencium\/","title":{"rendered":"Lawrencium (Lr)"},"content":{"rendered":"\n

Lawrencium is a synthetic chemical element with atomic number 103 in the periodic table. This man-made radioactive actinide metal has not been detected in Earth\u2019s crust yet. A member of the actinide series in the periodic table, lawrencium has three valence electrons on the outer shell that help element 103 participate in the formation of chemical bonds.\u00a0<\/span><\/p>\n\n\n\n

<\/div>\n\n\n\n

Chemical and Physical Properties of Lawrencium<\/span><\/h3>\n\n\n\n
Property<\/strong><\/td>Value<\/strong><\/td><\/tr>
Symbol<\/td>Lr<\/td><\/tr>
Atomic number<\/td>103<\/td><\/tr>
Atomic weight (mass)<\/td>(262) g.mol-1<\/td><\/tr>
Group (number)<\/td>Actinides<\/td><\/tr>
Period<\/td>7<\/td><\/tr>
Color<\/td>Presumably metallic and silvery-white or grey<\/td><\/tr>
Physical state<\/td>Presumably solid at room temperature<\/td><\/tr>
Half-life<\/td>From 27(+118-13) milliseconds to 11 hours<\/td><\/tr>
Electronegativity according to Pauling<\/td>Unknown<\/td><\/tr>
Density<\/td>Unknown<\/td><\/tr>
Melting point<\/td>Unknown<\/td><\/tr>
Boiling point<\/td>Unknown<\/td><\/tr>
Van der Waals radius<\/td>Unknown<\/td><\/tr>
Ionic radius<\/td>Unknown<\/td><\/tr>
Isotopes<\/td>14<\/td><\/tr>
Most characteristic isotope<\/td>262Lr<\/td><\/tr>
Electronic shell<\/td>[Rn] 5f14 6d1 7s2<\/td><\/tr>
The energy of the first ionization<\/td>Unknown<\/td><\/tr>
The energy of the second ionization<\/td>Unknown<\/td><\/tr>
Discovery date<\/td>1961 by Albert Ghiorso<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Lawrencium is a transfermium element classified in the periodic table under the symbol Lr, with atomic number 103, and with an assumed atomic mass of (262) g.mol<\/span>-1<\/span>. Its electron configuration is [Rn] 5f<\/span>14<\/span> 6d<\/span>1<\/span> 7s<\/span>2<\/span>. <\/span><\/p>\n\n\n\n

In the periodic table, this chemical is located to the right of the nobelium, left of the 6d transition metal rutherfordium<\/a>, and under the lanthanide lutetium. Despite the fact that lawrencium is placed in the d-block, a place designated for the transition metals, the International Union of Pure and Applied Chemistry (IUPAC) classified it as an actinide.<\/span><\/p>\n\n\n\n

The list of chemical properties of this highly radioactive metal is limited to little data. Namely, element 103 has not yet been thoroughly studied due to the minuscule amounts in which it\u2019s produced. However, it\u2019s considered to be chemically similar to the element lutetium<\/a> and the d-block elements according to research that has been conducted so far. <\/span><\/p>\n\n\n\n

The first ionization energy of lawrencium was measured in 2015, by using the 256Lr isotope of lawrencium (4.96+0.08\u22120.07 eV).\u00a0<\/span><\/p>\n\n\n\n

<\/div>\n\n\n\n

How Was Lawrencium Discovered?<\/span><\/h2>\n\n\n\n

The first forms of lawrencium were produced by two teams of scientists in two independent studies.\u00a0<\/span><\/p>\n\n\n\n

<\/div>\n\n\n\n

The Discovery of the Berkeley Team (1961)<\/span><\/h3>\n\n\n\n

In 1961, the first atoms of lawrencium were produced at the University of California, Berkeley, United States. While working in the Lawrence Radiation Laboratory (today known as the Lawrence Berkeley Laboratory), a team of scientists led by Albert Ghiorso attempted bombarding a mixture of the longest-lived isotopes of californium<\/a> (atomic number 98) with boron<\/a> ions (atomic number 5). This procedure was followed by the acceleration of the ions in a heavy-ion linear accelerator. <\/span><\/p>\n\n\n\n

As a result, the 258Lr isotope was produced as the very first form of the new element. This form of lawrencium decayed by emitting an 8.6 MeV alpha particle with a half-life of 4.2 seconds.<\/span><\/p>\n\n\n\n

<\/div>\n\n\n\n

The Discovery of the Dubna Team (1965)<\/span><\/h3>\n\n\n\n

Several years later, a team of Soviet scientists employed at the Joint Institute for Nuclear Research in Dubna, near Moscow, Russia, led by the Soviet nuclear physicist Georgy Flerov (1913 – 1990), managed to produce the lawrencium-256 isotope, with a half-life of 36 seconds. This was achieved by bombarding an isotope of americium<\/a> with an isotope of oxygen<\/a> in 1965. <\/span><\/p>\n\n\n\n

After lawrencium-126 was produced, the Berkeley team of scientists conducted a study that also included this form of lawrencium. The results of their scientific research showed some of the chemical properties of element 103. Namely, they observed that the properties of lawrencium resemble the tripositive elements in the actinoid series more closely than element 102, nobelium.\u00a0<\/span><\/p>\n\n\n\n

<\/div>\n\n\n\n

How Did Lawrencium Get Its Name?<\/span><\/h2>\n\n\n\n

Element 103 got its name from the inventor of the <\/span>cyclotron<\/span><\/i>, Ernest O. Lawrence. This American physicist succeeded in creating a revolutionary research instrument that helped the discovery of several new chemical elements. <\/span><\/p>\n\n\n\n

The element was named by the researchers upon its discovery, but it was not officialized by the International Union of Pure and Applied Chemistry (IUPAC) until 1997.\u00a0<\/span><\/p>\n\n\n\n

<\/div>\n\n\n\n

Where Can You Find Lawrencium?<\/span><\/h2>\n\n\n\n

Since lawrencium is a man-made radioactive element produced through nuclear bombardment, it does not occur naturally. This actinide occurs only in strictly regulated scientific lab conditions in extremely small quantities. Lawrencium metal has not been produced yet.\u00a0<\/span><\/p>\n\n\n\n

<\/div>\n\n\n\n

Lawrencium in Everyday Life<\/span><\/h2>\n\n\n\n

This radioactive element has no application in everyday life. It\u2019s used only for the purposes of scientific research.\u00a0<\/span><\/p>\n\n\n\n

<\/div>\n\n\n\n

How Dangerous Is Lawrencium?<\/span><\/h2>\n\n\n\n

Lawrencium is not considered to have any adverse effects upon health, because its isotopes are very short-lived and unstable.\u00a0<\/span><\/p>\n\n\n\n

<\/div>\n\n\n\n

Environmental Effects of Lawrencium<\/span><\/h2>\n\n\n\n

Element 103, like all of the transfermium elements, does not occur naturally. Thus, it doesn\u2019t pose any environmental hazard, unless it\u2019s released into the environment through nuclear debris.\u00a0\u00a0<\/span><\/p>\n\n\n\n

<\/div>\n\n\n\n

Isotopes of Lawrencium<\/span><\/h2>\n\n\n\n

There are 14 forms of lawrencium with atomic mass numbers ranging from 255 through 260. As lawrencium is a synthetically produced element, there is no standard atomic mass that can be assigned to the substance. <\/span><\/p>\n\n\n\n

Additionally, since it\u2019s a radioactive element, lawrencium does not have stable isotopes. With a half-life of 11 hours, lawrencium-266 is the longest living radioisotope of this transfermium element. <\/span><\/p>\n\n\n\n

Lawrencium-262 is the most stable isotope of lawrencium. It has a half-life of 4 hours and decays into:<\/span><\/p>\n\n\n\n