Cobalt
Susan Watt
Cobalt
Age Rating, Reading Level & Content Guide
by Susan Watt
The text is written at a 8th grade reading level, the subject matter is intended for middle graders (ages 9–12), and the content is gentle with no concerning themes.
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About This Book
Discover the fascinating world of cobalt, from its discovery to the unique qualities that make it essential in nature and daily life. Explore how this special element plays a vital role in our bodies and the world around us. Perfect for curious young scientists eager to learn about the building blocks of the universe.
Themes
Quick Assessment
This is a Level 8-9 book with gentle content intensity. It's a Sweet Spot read — challenging text with gentle themes, ideal for advanced or 2e readers. No notable content concerns flagged. Written for readers ages 9-12.
Why we rated Cobalt 12C
Cobalt is written at a Level 8-9 reading level (approximately 5,250 words). Strong independent readers around grade 9.1 can typically handle this book on their own; with parent or teacher support, Cobalt works for readers up to grade 10.1.
Read aloud, Cobalt takes about 35 minutes, which fits within a single read-aloud session.
We rate Cobalt as 12C ("Clear") because the content sits in the "Gentle" range — no conflict beyond everyday childhood experiences. Across our four dimensions (emotional, physical, social, thematic) the book reads as evenly gentle; no single dimension stands out as a concern.
No specific content flags were raised by community reviewers, which is consistent with the gentle intensity score.
Thematically, Cobalt explores science & nature, chemical elements, and education — these threads give the book room to mean different things to different readers.
Good fit for
- ✓ Children in the Ages 9-12 range — the maturity and attention span match the story's pacing.
- ✓ Readers who like a steady plot with enough momentum to keep pages turning.
- ✓ Kids drawn to stories about science & nature, chemical elements, education.
- ✓ Readers who fall hard for one book and want a long series to live in — there are 15 more books in the Elements (Marshall Cavendish) series.
- ✓ Curious kids who prefer real-world topics over made-up stories.
Maybe not for
- ! Readers whose emotional readiness lags behind their decoding skills — this book's intensity outruns its reading level, a classic "gifted kid" mismatch.
For Parents
Content Intensity
12C — ClearNo conflict beyond everyday childhood experiences. Safe for sensitive readers.
Was our "Gentle" content intensity rating accurate for this book?
Reading Insights
Hook Factor
5/10Engaging read with solid pacing and interesting themes.
Discussion Potential
1/10A lighter read — great for independent enjoyment.
Book DNA
Multi-dimensional content fingerprint
More in the Elements (Marshall Cavendish) Series
Sodium (Elements)
Anne O'Daly
Sodium (Elements)
Anne O'Daly
Chlorine (Elements)
Susan Watt
Chlorine (Elements)
Susan Watt
Lead
Susan Watt
Lead
Susan Watt
Tungsten (Elements)
Kerry Turrell
Tungsten (Elements)
Kerry Turrell
Tin (Elements)
Leon Gray
Tin (Elements)
Leon Gray
Iodine
Leon Gray
Iodine
Leon Gray
Mercury
Susan Watt
Mercury
Susan Watt
Chromium
Nathan Lepora
Chromium
Nathan Lepora
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Details
Book Length
- ISBN
- 0761422005
- Publisher
- Marshall Cavendish Benchmark
- Published
- 2007
- Type
- Nonfiction
- Word Count
- 5,250
- Read-Aloud
- ~35 min