Syllables    Rhymes    Quiz

radioactive

How many syllables in radioactive?

  5 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:

Cite This Source

Bibliography Citations
MLA   |    APA   |   Chicago Manual Style
"radioactive." HowManySyllables.com. How Many Syllables, n.d. Web. 12 May 2026.

Learn a New Word

Wondering why radioactive is 5 syllables?   Contact Us!   We'll explain.

Syllable Rules

1.  What is a syllable?
2.  How to count syllables.
3.  How to divide into syllables.

More Grammar
Trending Words
Syllable Quiz
Can you divide
oil into syllables?
Take the Syllable Quiz

Syllables    Rhymes    Quiz

What rhymes with radioactive

2 syllables
  • active
    3 syllables
    4 syllables
    5 syllables
    Teachers
    We award $250 every month to
    help teachers
    teach their students.
    $Read the contest rules and apply
    Fun Fact
    “Orange” became the term for
    a fruit in the 13th century.
    !Get more facts
    FAQ
    How many syllables
    in anthropology?
    ?Learn Here
    Do You Know
    the difference between
    Was and Were?
    Find Out Here

    Parents, Teachers, StudentsDo you have a grammar question?
    Need help finding a syllable count?
    Want to say thank you?

    Contact Us!