Tellurium
METALLOID
Bohr Model: Electrons arranged in energy shells around the nucleus.
Tellurium is a chemical element with symbol Te and atomic number 52. It is a brittle, mildly toxic, rare, silver-white metalloid. Tellurium is chemically related to selenium and sulfur.
Quick Facts
Atomic Number 52
Period 5
Group 16
Phase Solid
Appearance Unknown
About Metalloids
Metalloids have properties intermediate between metals and nonmetals. They often act as semi-conductors, making them essential for electronics.
History
Discovered By Franz-Joseph Müller von Reichenstein
Named By Unknown
Physical Properties
Atomic Mass 127.603
Density 6.24 g/L
Molar Heat 25.73 J/(mol·K)
Phase Transition (Melting & Boiling Points)
Tellurium melts at 722.66 K and boils at 1261 K.
Atomic Properties
Electron Config [Kr] 4d10 5s2 5p4
Electronegativity 2.1
Electron Affinity 190.161 kJ/mol
Ionization Energy 869.3 kJ/mol
Orbital Filling Diagram
This diagram visualizes electron configuration according to the Aufbau principle and Hund's rule.
Boxes represent orbitals (s, p, d, f), while arrows indicate electrons with spin up or down.
Electrons fill lower energy levels first and occupy orbitals singly before pairing.
Photograph
External Resources
Study Guide
Atomic Number
The number of protons in the nucleus, which defines the element.
Atomic Mass
The average mass of an atom, including protons and neutrons.
Electronegativity
A measure of how strongly an atom attracts electrons in a bond.
Ionization Energy
The energy required to remove an electron from an atom.
Electron Config
The arrangement of electrons in the atom's energy shells.