How many syllables in radioactive?

  456781932 syllables

Divide radioactive into syllables:   ra-di-o-ac-tive
Primary syllable stress:   ra-di-o-ac-tive
Secondary syllable stress:   ra-di-o-ac-tive
How to pronounce radioactive:   rey-dee-oh-ak-tiv
How to say radioactive:   radioactive syllables

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