86
Rn
Radon
222
Radon
NOBLE GAS
Bohr Model: Electrons arranged in energy shells around the nucleus.
Radon is a chemical element with symbol Rn and atomic number 86. It is a radioactive, colorless, odorless, tasteless noble gas, occurring naturally as a decay product of radium. Its most stable isotope, 222Rn, has a half-life of 3.8 days.
Quick Facts
Atomic Number 86
Period 6
Group 18
Phase Gas
Appearance colorless gas, occasionally glows green or red in discharge tubes
About Noble Gass
Noble gases are colorless, odorless, and extremely unreactive (inert) due to having full valence electron shells.
History
Discovered By Friedrich Ernst Dorn
Named By Unknown
Physical Properties
Atomic Mass 222
Density 9.73 g/L
Molar Heat N/A J/(mol·K)
Phase Transition (Melting & Boiling Points)
Radon melts at 202 K and boils at 211.5 K.
Atomic Properties
Electron Config [Xe] 4f14 5d10 6s2 6p6
Electronegativity 2.2
Electron Affinity -68 kJ/mol
Ionization Energy 1037 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.
Emission Spectrum
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.