Lithium Element in Periodic Table | Atomic Number Atomic Mass
Lithium is the lightest solid metal in the first group of periodic table. Its atomic number is three. Its atomic structure comprises a completely filled s-orbital and only one electron in its p-orbital. Due to the presence of incompletely p-orbital, it is very reactive and is seldom found freely in nature.
Pure lithium metal is preserved in since it catches fire when it comes in contact with oxygen in the air. When cut open, it displays metallic lustre momentarily which soon changes into greyish white tinge due to corrosion by moist air and immediately into black colour.
There are two isotopes of lithium occurring naturally, Li -6 and Li-7, of which Li-7 is more abundant by 92.5% in nature.
Uses of Lithium Element:
- It is used in ceramic and glass industry.
- It is used as an important component of battery electrolytes and electrodes, because of its high electrode potential.
- It is used in preparing high-temperature resistant greases in industries.
- Metallic lithium or its complex hydrides like lithium aluminum hydride are used as high-energy additives to rocket propellants. Lithium aluminum hydride itself is used as a solid fuel.
- It is used as a medicinal remedy in treating bipolar disorder, schizophrenia etc.
Lithium Element Information:
Discovery year: 1817
Discovered by: Johan August Arfwedson
Atomic number: 3
Relative atomic mass: 6.938, 6.997
Electron configuration: [He] 2s1
Other elements in the same block
Period: period 2
Other elements in the same period
Group: group 1 (alkali metals)
Other elements in the same group
Other elements in the same orbital
Beryllium is the element in the same orbital.
Key isotopes: 7Li
Melting point: 453.65 K (180.50 °C, 356.90 °F)
Boiling point:1603 K (1330 °C, 2426 °F)
Element category: alkali metal
Density (g cm−3): 0.534 g/cm3
CAS number: 7439-93-2
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