What is Lanthanum Atomic Number Electronic Configuration and Uses
Electronic Configuration of Lanthanum
Lanthanum, denoted by La, is a chemical element and a rare earth metal present in the Group 3 of the modern periodic table. It is known to be the prototype of the lanthanide series of the elements of the periodic table.
Lanthanum is a malleable and ductile metal, which is silvery-white in colour. It is softer enough that it can be even easily cut through a knife. Lanthanum is known to be the second most reactive rare-earth metals, the first being europium. The lanthanum compound tends to oxidize in the presence of air when kept at a room temperature and forms La₂O₃. It tends to react slowly with water and dissolves faster in the dilute acids, with an exception being the hydrofluoric acid, HF. this is due to the formation of the protective layer of fluoride, LaF₃ on the metal surface.
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What is Lanthanum
Lanthanum is a type of a chemical element denoted by the symbol La. The atomic number of lanthanum is 57. It is ductile and soft silvery-white metal which slowly tarnishes when it is exposed to the air. Lanthanum acts as the eponym of the lanthanide series, which is a group of 15 elements similar to one another starting from lanthanum to lutetium in the modern periodic table. Lanthanum lies first in the group and is hence the prototype.
Lanthanum is regarded traditionally amongst the rare earth metals. It possesses an oxidation state of +3. The element does not show any biological role when it comes to humans, but it is important to a few bacterial species. It does not prove toxic to humans but possesses antimicrobial activity.
Chemical Properties of Lanthanum
Properties of Lanthanum
Lanthanum is found abundantly in the environment.
It is silvery-white in colour
Lanthanum is active, ductile and soft.
Lanthanum tends to oxidize when reacted with water and forms its respective hydroxide.
The lanthanum salts are not soluble in water.
Uses of Lanthanum
Chemical form of lanthanum has its usage in the modern energy-saving lamps, televisions, fluorescent lamps and tubes, etc.
Lanthanum is also used in optics in the form of radiation-absorbing glasses and lenses.
It also increases the malleability and the resistivity of the steel.
Lanthanum is used to polish glass and to produce catalysts.
It is also used in the petroleum refineries for catalysis.
Health-Related Facts of Lanthanum
The primary problem associated with the lanthanum element is its disposal by the industries. The industrial wastes get dumped directly into the water bodies, mainly from the petroleum industries.
It tends to cause severe damage to both plants and animals and nervous system disorders amongst us humans.
FAQs on Lanthanum Chemical Element Overview and Properties
1. What is lanthanum?
Lanthanum is a chemical element with atomic number 57 and symbol La, belonging to the lanthanide series of the periodic table.
- It is a soft, silvery-white metal.
- It is classified as a rare earth element.
- It commonly forms a +3 oxidation state in compounds.
- It is placed in period 6 and group 3 of the periodic table.
2. What is the electron configuration of lanthanum?
The electron configuration of lanthanum (La) is [Xe] 5d1 6s2.
- Atomic number = 57, so it has 57 electrons.
- The configuration is based on the noble gas core [Xe] (54 electrons).
- After xenon, electrons fill the 5d and 6s orbitals.
3. What is the oxidation state of lanthanum?
Lanthanum most commonly exhibits an oxidation state of +3 in its compounds.
- It loses three electrons to form the ion La3+.
- These electrons are typically removed from the 6s and 5d orbitals.
- The +3 state is highly stable due to its resulting noble gas configuration.
4. Is lanthanum a transition metal or a lanthanide?
Lanthanum is classified as a lanthanide, although it is sometimes grouped with transition metals due to its position in group 3.
- It is the first element of the lanthanide series.
- Lanthanides are also called inner transition metals.
- Unlike most lanthanides, lanthanum has no 4f electrons in its ground state.
5. What is the atomic mass of lanthanum?
The atomic mass of lanthanum is approximately 138.91 u.
- Its most abundant natural isotope is La-139.
- Lanthanum has one stable isotope and several radioactive isotopes.
- The atomic mass reflects the weighted average of its naturally occurring isotopes.
6. How does lanthanum react with oxygen?
Lanthanum reacts readily with oxygen to form lanthanum(III) oxide, La2O3.
- The balanced reaction is: 4La(s) + 3O2(g) → 2La2O3(s).
- This reaction occurs when lanthanum is exposed to air.
- The oxide layer forms on the metal surface.
7. What are the common compounds of lanthanum?
Common lanthanum compounds include LaCl3, La2O3, and La(OH)3.
- Lanthanum chloride (LaCl3) is used in catalysts and research.
- Lanthanum oxide (La2O3) is used in optical glasses.
- Lanthanum hydroxide (La(OH)3) forms when La3+ reacts with OH- ions.
8. What are the uses of lanthanum in chemistry and industry?
Lanthanum is used in catalysts, optical glass, batteries, and hydrogen storage materials.
- Lanthanum oxide improves refractive index in special glasses.
- Lanthanum is used in nickel–metal hydride (NiMH) batteries.
- Lanthanum compounds act as catalysts in petroleum refining.
- Lanthanum alloys are used in lighter flints.
9. How is lanthanum extracted from its ores?
Lanthanum is extracted from rare earth minerals such as monazite and bastnäsite through chemical separation processes.
- The ore is first treated with acid or alkali to dissolve rare earth elements.
- Lanthanum is separated using solvent extraction or ion-exchange methods.
- The metal is obtained by reduction of anhydrous LaCl3 with calcium: 2LaCl3(l) + 3Ca(s) → 2La(s) + 3CaCl2(l).
10. What is the difference between lanthanum and other lanthanides?
Lanthanum differs from most other lanthanides because it has no electrons in the 4f subshell in its ground state.
- Electron configuration: [Xe] 5d1 6s2.
- Other lanthanides typically have partially filled 4f orbitals.
- Lanthanum commonly forms only the +3 oxidation state, similar to most lanthanides.
