Lawrencium is the heaviest element that comes under the actinide series. Let us discuss some facts about Lawrencium in detail.
Lawrencium is a member of rare earth metals which does not occur naturally. It is produced in particle accelerators by bombarding lighter elements with charged particles. It has malleable, sonorous, and ductile properties.
In detail below, discuss some more chemical properties like melting point, boiling point, ionization energy, and oxidation state.
Lawrencium symbol
Lr represents the chemical symbol of Lawrencium.
Lawrencium group in the periodic table
Lr is placed in group 3 of the periodic table.
Lawrencium period in the periodic table
Lr is classified as the first of the 7th-period transition metals in the periodic table with 7 electron shells.
Lawrencium block in the periodic table
Lr is in the f-block of the periodic table.
Lawrencium atomic number
The atomic number of the Lr is 103.
Lawrencium atomic Weight
The atomic weight of Lawrencium is 262 g/mol.
Lawrencium Electronegativity according to Pauling
Pauling electronegativity of Lr is 1.30.
Lawrencium atomic Density
The atomic Density of Lr is 14.4 g/cm3.
Lawrencium melting point
1627˚C is the melting point of Lawrencium.
Lawrencium boiling point
Lawrencium’s boiling point is unknown because it is a synthetic unstable element with a limited half-life of three minutes. Due to this, they are prepared only in nanograms, so it isn’t easy to study some of the properties.
Lawrencium Van der Waals radius
The van der waals radius of Lr is 246 pm.
Lawrencium ionic/covalent radius
The covalent radius of Lr is 1.61×10-10m. But its ionic radius is very small compared to the other members of the actinides series. This is because of the actinoid contraction.
Lawrencium isotopes
Isotopes are atoms of the same element with different atomic masses but the same atomic number. Let us discuss the isotopes of Lawrencium in detail.
Lawrencium has 14 isotopes ranging from 251Lr to 266Lr. It does not have stable isotopes as it is a synthetic element.
| Isotopes | Half-life | Decay mode | Daughter isotope |
| 251Lr | 27 ms | Spontaneous fission (SF) | various |
| 252Lr | 390(90) ms | SF, β+, α | 248Md, 252No |
| 253Lr | 580(70) ms | SF, β+, α | 249Md, 253No |
| 254Lr | 13(3) s | SF, β+, α | 250Md, 254No |
| 255Lr | 22(4) s | SF, β+, α | 251Md, 255No |
| 256Lr | 27(3) s | SF, β+, α | 252Md, 256No |
| 257Lr | 646(25) ms | SF, β+, α | 253Md, 257No |
| 258Lr | 4.1(3) s | SF, β+, α | 254Md, 258No |
| 259Lr | 6.2(3) s | SF, β+, α | 255Md, 259No |
| 260Lr | 2.7 min | SF, β+, α | 256Md, 260No |
| 261Lr | 44 min | SF, α | 257Md, various |
| 262Lr | 216 min | β+, α | 258Md, 262No |
| 264Lr | 4.9(+2.1-1.3) h | SF | various |
| 266Lr | 11 h | SF | various |
Lawrencium electronic shell
The electronic shell is an orbit followed by the electrons surrounding the atomic nucleus. Let us discuss the electronic shell of Lr.
The electronic shell of Lr is 2,8,18,32,32,8,3.
Lawrencium energy of first ionization
The first ionization energy of Lr is 478.6 KJ/mol.
Lawrencium energy of second ionization
The second ionization energy of Lr is 1428 KJ/mol.
Lawrencium energy of third ionization
The third ionization energy of Lr is 2219.1 KJ/mol.
Lawrencium oxidation states
The oxidation state of Lr is +3.
Lawrencium electron configurations
The electron configuration of an element tells how electrons are distributed in its atomic orbitals. Let us explore the electron configuration of Lawrencium.
- The electron configuration of Lawrencium is 1s2 2s2 2p6 3s2 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 5f14 7s2 7p1
- The reduced electronic configuration of Lr is [Rn] 5f14 7s2 7p1 which contains 103 electrons.
Lawrencium CAS number
The CAS number of Lawrencium is 22537-19-5.
Lawrencium ChemSpider ID
The ChemSpider ID of Lawrencium is 28934.
Lawrencium allotropic forms
Allotropes exist in various forms of an element that show identical chemical properties but differ in their physical properties. Let us discuss allotropic forms of Lr.
Lawrencium does not have any allotropic forms. It does not show catenation property as this element does not have capable of forming shorter and stronger self-linking of atoms to form chains and rings.
Lawrencium chemical classification
- Lawrencium is classified into actinides, the 5f block or inner transition element.
- Lr is very reactive as it is radioactive metal and has the smallest half-life of three minutes.
Lawrencium state at room temperature
Lr is solid at room temperature.
Is Lawrencium paramagnetic?
When the external magnetic field is applied, paramagnets are weakly attracted but if we remove the field, do not retain magnetization. Let us discuss the paramagnetic of Lr.
Lr is paramagnetic due to unpaired electrons in the 7p orbitals.
Conclusion:
Lawrencium is a synthetic radioactive metal having the smallest half-life. It is present in the 5f block element of the actinides series with an atomic number of 103. It is paramagnetic in nature.
Hi….I am Supriya Upadhya, a Post Graduate in Organic chemistry with good understanding of Chemistry concepts and worked as Junior research fellow in synthesis of anti cancer agent. Also worked on Anti-Microbial Polymer synthesis as part of Post graduate thesis.