Element 55 of Periodic table is
Cesium with atomic number 55,
atomic weight 132.90545.
Cesium, symbol Cs, has a
Body Centered Cubic structure and Silver color.
Cesium is a alkali metal element.
Trivial name of Cesium is alkali metals*.
Know everything about Cesium Facts, Physical Properties, Chemical
Properties, Electronic configuration, Atomic and Crystal Structure.
Caesium or cesium is a chemical element with symbol Cs and atomic number 55. It is a soft, silvery-gold alkali metal with a melting point of 28 °C (82 °F), which makes it one of only five elemental metals that are liquid at or near room temperature. Caesium is an alkali metal and has physical and chemical properties similar to those of rubidium and potassium.
Read key information and facts about element Cesium
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
55 to find Cesium 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 Cesium on periodic
table look for cross section of group 1 and period
6 in the modern periodic table.
Interactive Periodic Table to Understand
and Learn Cool Trends
The element Cesium was discovered by Robert Bunsen in year
1860 in Germany
derived its name from the Latin caesius, meaning 'sky blue'
The table below shows the abundance of Cesium in Universe, Sun, Meteorites,
Earth's Crust, Oceans and Human Body.
The solid state structure of Cesium is Body Centered Cubic.
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.
Cesium atoms have 55 electrons and
the electronic shell structure is [2, 8, 18, 18, 8, 1] with Atomic Term Symbol (Quantum Numbers) 2S1/2.
Shell Structure of Cesium - Electrons per energy
The ground state electronic configuration of Neutral Cesium atom is
The portion of Cesium 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 6s1, electrons in
the outermost shell that determine the chemical properties of the element.
Complete ground state electronic configuration for the Cesium atom, Unabbreviated electronic configuration
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 6s1
Cesium atomic radius is 298 pm, while it's covalent radius is 225 pm.
The electron affinity of Cesium is 45.5 kJ/mol
Refer to table below for Ionization energies of Cesium
Refer to below table for Cesium Physical Properties
Cesium is Conductor of electricity. Refer to
below for the Electrical properties of Cesium
Refer to table below for Thermal properties of Cesium
Isotopes of rhodium. Naturally occurring Cesium has
1 stable isotope -
List of unique identifiers to search the element in various chemical registry databases