What Is Ytterbium?
Ytterbium is a chemical element with the symbol Yb and atomic number 70, part of the lanthanide series of rare earth elements.
A soft, malleable rare earth. Ytterbium clocks are the most accurate ever built.
As a lanthanide in Period 6 and Group 3 (Transition Metals), ytterbium's placement on the table reflects its electron configuration of [Xe] 4f¹⁴ 6s², which governs its bonding behavior and the type of compounds it typically forms.
Position on the Periodic Table
Ytterbium is located in Period 6, an unusually long row that includes the entire lanthanide series.
Within that row, ytterbium sits in Group 3 (Transition Metals), alongside elements that share a similar number of valence electrons and, by extension, similar chemical behavior.
This position is not arbitrary — the periodic table was deliberately organized so that an element's row and column reveal its expected reactivity, bonding pattern, and physical state at a glance.
Physical & Chemical Properties
Ytterbium has an atomic mass of 173.045 u and a density of 6.90 g/cm³. Its melting point is 824°C and its boiling point is 1196°C.
Ytterbium displays the typical lanthanide combination of a silvery appearance and chemistry dominated by its f-orbital electrons.
Electron Configuration Explained
Ytterbium's electron configuration is [Xe] 4f¹⁴ 6s², describing how its electrons are distributed across shells and subshells around the nucleus.
Reading the configuration in order shows electrons filling shells of increasing energy, following the standard Aufbau principle that explains how atomic structure builds up across the periodic table.
The outermost (valence) electrons shown in this configuration are what ultimately determine ytterbium's chemical reactivity and the type of bonds it forms with other elements.
History & Discovery
Ytterbium was formally discovered in 1878, J.C.G. de Marignac, identified through the careful isolation and analytical techniques typical of that era's chemical research.
Many elements from this period were anticipated by Dmitri Mendeleev's periodic table, which successfully predicted gaps corresponding to undiscovered elements well before laboratory instruments existed to confirm them directly.
What Is Ytterbium Used For?
Ytterbium's specific properties make it useful in several applications, including:
- Atomic clocks
- Fiber optic amplifiers
- Stainless steel
- Radiation dosimeters
- Superconductors
These uses reflect ytterbium's underlying classification as a lanthanide, since the same properties that define its category in chemistry also determine where it becomes practically useful.
Fun Facts About Ytterbium
- Ytterbium atomic clocks lose only 1 second in 10 billion years.
- Ytterbium is element number 70 on the periodic table, in Period 6 and Group 3.
- Its standard atomic mass is 173.045 u, calculated from the natural abundance of its isotopes.
Frequently Asked Questions
What is Ytterbium's atomic number?
Ytterbium has atomic number 70.
What is Ytterbium's chemical symbol?
Ytterbium's symbol is Yb.
What group and period is Ytterbium in?
Ytterbium is in Period 6, Group 3 (Transition Metals).
What is Ytterbium's atomic mass?
Ytterbium's standard atomic mass is 173.045 u.