What reading level is The story of hydrogen?

The story of hydrogen by Mark Uehling is at a Level 7-8 reading level. Recommended for Middle Grades readers (Ages 9-12).

What age is The story of hydrogen appropriate for?

The story of hydrogen is recommended for Ages 9-12. HootRating: 12C (Clear).

What genre is The story of hydrogen?

The story of hydrogen is nonfiction — Chemical elements. Part of the First Book series.

Does The story of hydrogen have any content warnings?

The story of hydrogen has a HootRating of 12C (Clear). No specific content flags noted. On HootRated, every book is rated across four dimensions — emotional, physical, social, and thematic — to help parents make informed choices.

How many pages is The story of hydrogen?

The story of hydrogen by Mark Uehling is 63 pages (approximately 6,687 words).

Reviewed by HootRated editorial · Last updated May 18, 2026

The story of hydrogen

Mark Uehling

The story of hydrogen

Age Rating, Reading Level & Content Guide

by Mark Uehling

First Book

Reading Level 7-8 12C Ages 9-12 Sweet Spot Page-Turner

The text is written at a 7th 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 journey of hydrogen, from its groundbreaking discovery to its unique properties and many uses in our world. This captivating tale brings science to life, making the wonders of this essential element easy to understand and fun to explore.

Themes

Science & Nature

Quick Assessment

This is a Level 7-8 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 The story of hydrogen 12C

The story of hydrogen is written at a Level 7-8 reading level across 63 pages (approximately 6,687 words). Strong independent readers around grade 8.3 can typically handle this book on their own; with parent or teacher support, The story of hydrogen works for readers up to grade 9.3.

Read aloud, The story of hydrogen takes about 45 minutes, which fits within a single read-aloud session.

We rate The story of hydrogen 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, The story of hydrogen centers on science & nature.

Good fit for

✓ Children in the Ages 9-12 range — the maturity and attention span match the story's pacing.
✓ Reluctant readers who need fast-paced, hook-heavy stories to stay engaged.
✓ Kids drawn to stories about science & nature.
✓ Readers who fall hard for one book and want a long series to live in — there are 14 more books in the First Book 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.