What Is Nobelium?
Nobelium is a chemical element with the symbol No and atomic number 102, part of the radioactive actinide series.
Named after Alfred Nobel, inventor of dynamite and founder of the Nobel Prizes.
As a actinide in Period 7 and Group 3 (Transition Metals), nobelium's placement on the table reflects its electron configuration of [Rn] 5f¹⁴ 7s², which governs its bonding behavior and the type of compounds it typically forms.
Position on the Periodic Table
Nobelium is located in Period 7, the bottom row of the standard periodic table, consisting largely of radioactive and synthetic elements.
Within that row, nobelium 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
Nobelium has an atomic mass of (259) u and a density of ~9.9 g/cm³. Its melting point is 827°C and its boiling point is ~1100°C.
Nobelium is radioactive, like every other member of the actinide series, with a nucleus prone to spontaneous decay.
Electron Configuration Explained
Nobelium's electron configuration is [Rn] 5f¹⁴ 7s², 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 nobelium's chemical reactivity and the type of bonds it forms with other elements.
History & Discovery
Nobelium was formally discovered in 1966, Flerov, 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 Nobelium Used For?
Nobelium's specific properties make it useful in several applications, including:
- Research only
- Nuclear physics
- Scientific study
- No practical uses
- Academic research
These uses reflect nobelium's underlying classification as a actinide, since the same properties that define its category in chemistry also determine where it becomes practically useful.
Fun Facts About Nobelium
- Nobelium is named after Alfred Nobel, whose invention of dynamite funded the Nobel Prizes.
- Nobelium is element number 102 on the periodic table, in Period 7 and Group 3.
- Its standard atomic mass is (259) u, calculated from the natural abundance of its isotopes.
Frequently Asked Questions
What is Nobelium's atomic number?
Nobelium has atomic number 102.
What is Nobelium's chemical symbol?
Nobelium's symbol is No.
What group and period is Nobelium in?
Nobelium is in Period 7, Group 3 (Transition Metals).
What is Nobelium's atomic mass?
Nobelium's standard atomic mass is (259) u.