radon

Introduction References & Edit History Quick Facts & Related Topics

Images

A labeled diagram of the periodic table entry for radon shows its atomic number 86, symbol Rn, atomic weight 222, electron configuration, and name. It is identified as a noble gas with a face-centered cubic crystal structure.

Diagram showing how radon gas can enter a home through cracks in the floor, slab joints, hollow-block walls, drains, and around water supply pipes.

Explore an interactive periodic table of the elements

Line graph showing the first ionization energies of the elements as a function of atomic number, with peaks at noble gases like helium, neon, argon, krypton, xenon, and radon, and labeled elements at key points.

At a Glance

default image

radon: Media

chemical element

Images

A labeled diagram of the periodic table entry for radon shows its atomic number 86, symbol Rn, atomic weight 222, electron configuration, and name. It is identified as a noble gas with a face-centered cubic crystal structure.

radon

Properties of Radon.

Encyclopædia Britannica, Inc.

Diagram showing how radon gas can enter a home through cracks in the floor, slab joints, hollow-block walls, drains, and around water supply pipes.

Indoor air pollution: radon

Radon is a colorless and odorless radioactive gas that can enter homes in a number...

Encyclopædia Britannica, Inc.

Line graph showing the first ionization energies of the elements as a function of atomic number, with peaks at noble gases like helium, neon, argon, krypton, xenon, and radon, and labeled elements at key points.

first ionization energies of the elements

First ionization energies of the elements.

Encyclopædia Britannica, Inc.

Interactives

Explore an interactive periodic table of the elements

Explore an interactive periodic table of the elements

Periodic table of the elements.

Encyclopædia Britannica, Inc.

VIEW MORE in these related Britannica articles: