Element 69 of Periodic table is
Thulium with atomic number 69,
atomic weight 168.93421.
Thulium, symbol Tm, has a
Simple Hexagonal structure and Silver color.
Thulium is a lanthanide element.
Know everything about Thulium Facts, Physical Properties, Chemical
Properties, Electronic configuration, Atomic and Crystal Structure.
Thulium is a chemical element with symbol Tm and atomic number 69. It is the thirteenth and antepenultimate (third-last) element in the lanthanide series. Like the other lanthanides, the most common oxidation state is +3, seen in its oxide, halides and other compounds.
Read key information and facts about element Thulium
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
69 to find Thulium 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 Thulium 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 Thulium was discovered by Per Teodor Cleve in year
1879 in Sweden
derived its name from Thule, the ancient name for Scandinavia
The table below shows the abundance of Thulium in Universe, Sun, Meteorites,
Earth's Crust, Oceans and Human Body.
The solid state structure of Thulium 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.
Thulium atoms have 69 electrons and
the electronic shell structure is [2, 8, 18, 31, 8, 2] with Atomic Term Symbol (Quantum Numbers) 2F7/2.
Shell Structure of Thulium - Electrons per energy
The ground state electronic configuration of Neutral Thulium atom is
[Xe] 4f13 6s2.
The portion of Thulium 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 4f13 6s2, electrons in
the outermost shell that determine the chemical properties of the element.
Complete ground state electronic configuration for the Thulium atom, Unabbreviated electronic configuration
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f13 6s2
Thulium atomic radius is 222 pm, while it's covalent radius is N/A.
The electron affinity of Thulium is 50 kJ/mol
Refer to table below for Ionization energies of Thulium
Refer to below table for Thulium Physical Properties
Thulium is Conductor of electricity. Refer to
below for the Electrical properties of Thulium
Refer to table below for Thermal properties of Thulium
Isotopes of rhodium. Naturally occurring Thulium has
1 stable isotope -
List of unique identifiers to search the element in various chemical registry databases