# radon

> English word · Noun · IPA /ˈɹeɪdɒn/ · frequency rank #33,384

## Definitions
1. The chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas.
2. Radon-222 (22286Rn), the most stable isotope of said element.

## Etymology
Contraction of radium emanation, since the element appears in the radioactive decay of radium. By surface analysis, radio- + -on (“suffix for noble gases”).

## Easily confused with
- **ran** (https://plainspell.com/en/vs/radon-vs-ran)
- **Ron** (https://plainspell.com/en/vs/radon-vs-ron)
- **Rao** (https://plainspell.com/en/vs/radon-vs-rao)
- **rain** (https://plainspell.com/en/vs/radon-vs-rain)
- **redo** (https://plainspell.com/en/vs/radon-vs-redo)
- **raven** (https://plainspell.com/en/vs/radon-vs-raven)
- **razor** (https://plainspell.com/en/vs/radon-vs-razor)
- **Ramos** (https://plainspell.com/en/vs/radon-vs-ramos)
- **ramen** (https://plainspell.com/en/vs/radon-vs-ramen)
- **recon** (https://plainspell.com/en/vs/radon-vs-recon)
- **rayon** (https://plainspell.com/en/vs/radon-vs-rayon)
- **redox** (https://plainspell.com/en/vs/radon-vs-redox)
- **ripon** (https://plainspell.com/en/vs/radon-vs-ripon)
- **reason** (https://plainspell.com/en/vs/radon-vs-reason)
- **random** (https://plainspell.com/en/vs/radon-vs-random)
- **ration** (https://plainspell.com/en/vs/radon-vs-ration)
- **Ramona** (https://plainspell.com/en/vs/radon-vs-ramona)
- **redone** (https://plainspell.com/en/vs/radon-vs-redone)
- **rad** (https://plainspell.com/en/vs/rad-vs-radon)
- **rada** (https://plainspell.com/en/vs/rada-vs-radon)

## Common misspellings (7)
`ardon`, `raddon`, `radno`, `radonn`, `raodn`, `rdaon`, `rradon`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/radon