Reactivity & Chemical Bonding
Chemical Behavior & Oxidation States
Nobelium exhibits chemical reactivity characteristic of the actinide family, governed by an electronegativity of 1.3 and standard valence interactions.
Z = 102Actinide
Launch 3D Atom & Orbitals LabNobelium
No
Standard Atomic Mass: 259 u
Period 7Group 3F-Block
Chemical Specimen/No
Concentric Electron Shells7 Energy Levels
n=1: 2e⁻→
n=2: 8e⁻→
n=3: 18e⁻→
n=4: 32e⁻→
n=5: 32e⁻→
n=6: 8e⁻→
n=7: 2e⁻
Scientific Monograph • Actinide
3D Atom SimulatorNobelium (No) Scientific Profile
Nobelium (No) is an element with atomic number 102, classified as a actinide. Positioned in Period 7, Group 3, and F-block, its chemical and physical profile is defined by its electron configuration ([Rn]5f¹⁴7s²) and periodic trends.
Interactive Virtual Labs Available for Nobelium
3D Orbitals & Valence Lab
Simulate concentric quantum energy levels, observe valence electron spins, and examine live atomic clouds in full 3D.
Electronic Configuration Lab
Experiment with Aufbau subshell ordering, explore orbital occupancy, and analyze quantum configuration exceptions.
Electron Config
[Rn]5f¹⁴7s²
Electronegativity
1.3 Pauling
Year Discovered
1958
Orbital Shells
7 Principal Levels
Orbital Block
f-block orbital
Group / Period
G: 3 • P: 7
Technological Utility
Industrial & Energy Applications
Nobelium is utilized in industrial fabrication, materials engineering, electronic manufacturing, and advanced laboratory research based on its specific thermodynamic properties.
Biological Role
Biomedical Profile & Toxicity
Nobelium does not play a prominent biological role in human biochemistry, existing primarily as a trace element or mineral component in natural ecosystems.
Geochemistry & Abundance
Cosmic & Terrestrial Occurrence
Elements like Nobelium are synthesized through stellar nucleosynthesis and supernovae r-processes. On Earth, Nobelium is concentrated in specific ore deposits or synthesized in nuclear accelerators.
Frequently Asked Questions about Nobelium
Q
What are the key physical and atomic properties of Nobelium?
Nobelium (No) has an atomic number of 102 and a standard atomic mass of 259 u. It is positioned in Period 7, Group 3, in the F-block, and is classified within the Actinide category.
Q
What is the electron configuration of Nobelium?
The ground-state electron configuration of Nobelium is [Rn]5f¹⁴7s². Its 102 electrons are distributed across 7 principal energy levels (2, 8, 18, 32, 32, 8, 2).
Q
Why does Nobelium exhibit an electron configuration exception?
Nobelium follows standard Aufbau principle orbital filling. Transition metals and heavy elements optimize their shell filling based on subshell exchange energy and electrostatic stability.
Q
What are the primary commercial and laboratory uses of Nobelium?
Nobelium is utilized in industrial fabrication, materials engineering, electronic manufacturing, and advanced laboratory research based on its specific thermodynamic properties.