Element 57 of Periodic table is
Lanthanum with atomic number 57,
atomic weight 138.9055.
Lanthanum, symbol La, has a
Simple Hexagonal structure and Silver color.
Lanthanum is a lanthanide element.
Know everything about Lanthanum Facts, Physical Properties, Chemical
Properties, Electronic configuration, Atomic and Crystal Structure.
Lanthanum is a soft, ductile, silvery-white metallic chemical element with symbol La and atomic number 57. It tarnishes rapidly when exposed to air and is soft enough to be cut with a knife. It gave its name to the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table:it is also sometimes considered the first element of the 6th-period transition metals.
Read key information and facts about element Lanthanum
Explore our interactive periodic table
Periodic table is arranged by atomic number, number of protons in the nucleus which is same as number of
The atomic number increases from left to right. Periodic table starts at top left ( Atomic number 1) and
ends at bottom right (atomic number 118). Therefore you can directly look for atomic number
57 to find Lanthanum on periodic table.
Another way to read periodic table and locate an element is by using group number (column)
and period number (row). To locate Lanthanum on periodic
table look for cross section of group N/A and period
6 in the modern periodic table.
Interactive Periodic Table to Understand
and Learn Cool Trends
The element Lanthanum was discovered by Carl Gustaf Mosander in year
1839 in Sweden
derived its name from the Greek lanthanein, meaning 'to lie hidden'
The table below shows the abundance of Lanthanum in Universe, Sun, Meteorites,
Earth's Crust, Oceans and Human Body.
The solid state structure of Lanthanum is Simple Hexagonal.
The Crystal structure can be described in terms of its unit Cell. The unit Cells repeats itself in
dimensional space to form the structure.
The unit cell is represented in terms of its lattice parameters, which are the lengths of the cell
Lattice Constants (a, b and c)
and the angles between them Lattice Angles (alpha, beta and gamma).
The positions of the atoms inside the unit cell are described by the set of atomic positions (
xi, yi, zi) measured from a reference lattice point.
The symmetry properties of the crystal are described by the concept of space groups. All possible
symmetric arrangements of particles in three-dimensional space are described by the 230 space groups
(219 distinct types, or 230 if chiral copies are considered distinct.
Lanthanum atoms have 57 electrons and
the electronic shell structure is [2, 8, 18, 18, 9, 2] with Atomic Term Symbol (Quantum Numbers) 2D3/2.
Shell Structure of Lanthanum - Electrons per energy
The ground state electronic configuration of Neutral Lanthanum atom is
[Xe] 5d1 6s2.
The portion of Lanthanum configuration that is equivalent to the noble gas of
the preceding period, is abbreviated as [Xe]. For atoms with many electrons, this
notation can become lengthy and so an abbreviated notation is used.This is important as it is
the Valence electrons 5d1 6s2, electrons in
the outermost shell that determine the chemical properties of the element.
Complete ground state electronic configuration for the Lanthanum atom, Unabbreviated electronic configuration
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 5d1 6s2
Lanthanum atomic radius is 195 pm, while it's covalent radius is 169 pm.
The electron affinity of Lanthanum is 48 kJ/mol
Refer to table below for Ionization energies of Lanthanum
Refer to below table for Lanthanum Physical Properties
Lanthanum is Conductor of electricity. Refer to
below for the Electrical properties of Lanthanum
Refer to table below for Thermal properties of Lanthanum
Isotopes of rhodium. Naturally occurring Lanthanum has
1 stable isotope -
List of unique identifiers to search the element in various chemical registry databases