IPA: //ˈreɪdiəʊˌɛlɪmənt//
KK: /ˈreɪdioʊˌɛlɪmənt/
A type of element that is radioactive, either found in nature or made in a laboratory.
Uranium is a well-known radioelement used in nuclear power.
Radioelement → It is formed from "radio-" (from Latin "radius", meaning ray) and "element" (from Greek "stoicheion", meaning basic or fundamental substance). The word refers to a basic substance that emits rays, particularly in the context of radioactive materials.
Think of 'rays' ('radio-') being emitted by a 'basic substance' ('element') — that's what a radioelement is.
No commonly confused words.