Table of Contents
Is lanthanum a solid liquid or gas at room temperature?
| Lanthanum | |
|---|---|
| Phase at STP | solid |
| Melting point | 1193 K (920 °C, 1688 °F) |
| Boiling point | 3737 K (3464 °C, 6267 °F) |
| Density (near r.t. ) | 6.162 g/cm3 |
What phase is lanthanum at room temperature?
Basic information
| Name | Lanthanum |
|---|---|
| Density | 6.15 g /cm3 |
| Phase at Room Temperature | Solid |
| Ionization Energy | 5.577 eV |
| Oxidation State | +3 |
What is the standard state of lanthanum?
Solid
Fact box
| Group | Lanthanides | 920°C, 1688°F, 1193 K |
|---|---|---|
| Atomic number | 57 | 138.905 |
| State at 20°C | Solid | 139La |
| Electron configuration | [Xe] 5d16s2 | 7439-91-0 |
| ChemSpider ID | 22369 | ChemSpider is a free chemical structure database |
What are the physical properties of lanthanum?
Lanthanum is a soft, malleable, ductile, silver-white metal. Lanthanum is naturally found in sediments.: it oxidizes rapidly in air and it reacts with water to form the hydroxide.
How reactive is lanthanum?
It is the second most reactive of the rare-earth metals after europium. Lanthanum oxidizes in air at room temperature to form La2O3. It slowly reacts with water and quickly dissolves in diluted acids, except hydrofluoric acid (HF) because of formation of a protective fluoride (LaF3) layer on the surface of the metal.
Why is lanthanum in the F block?
Lanthanum is grouped in the F block since it has partially filled f-orbitals. F-orbitals of electron shells are filled with n – 2 electrons.
Is calcium solid at room temperature?
Calcium is a chemical element with symbol Ca and atomic number 20. Classified as an alkaline earth metal, Calcium is a solid at room temperature.
Why is lanthanum called lanthanum?
The element was discovered as the oxide (lanthana) in 1839 by Carl Gustaf Mosander, who distinguished it from cerium oxide (ceria). Its name is derived from the Greek lanthanein, meaning “to be concealed,” indicating that it is difficult to isolate. Lanthanum occurs in the rare-earth minerals monazite and bastnasite.
Where is lanthanum found?
Lanthanum is found in rare-earth minerals such as cerite, monazite, allanite, and bastnasite. Monazite and bastnasite are principal ores in which lanthanum occurs in percentages up to 25 percent and 38 percent respectively.
Does LA have an f orbital?
Lanthanum itself is sometimes considered to be a d-block element, because it has no electrons in an f orbital, but it does have one electron in a d orbital.