Spanning the alphabet, they are the only 2 chemical element names that end with the letter “C”

Friday’s episode of Jeopardy wrapped up the week with a clever and deceptively simple Final Jeopardy clue. The category was Chemical Element Names, and the clue asked: Spanning the alphabet, they are the only 2 chemical element names that end with the letter “C.” While it may have seemed like a basic trivia question about the periodic table, this one demanded careful attention to spelling and a thorough mental scan of all known elements.

What is Zinc & Arsenic?

These two elements—though not especially rare or obscure—share a unique distinction among the 118 entries in the periodic table. Despite the diversity in naming conventions, only these two end with the letter “C,” making the clue both precise and challenging.

Zinc and Arsenic: The Only Two Ending in “C”

Among all the known chemical elements, zinc and arsenic stand out for their unusual orthographic feature. Both names end in the letter “C,” which is uncommon not just in scientific terminology but in English-language word endings more generally. For most viewers familiar with chemistry, recognizing either element individually wouldn’t have been difficult—but realizing they are the only two that end with “C” required an extra level of attention.

Zinc is a well-known transition metal with the atomic number 30. It plays a critical role in human biology and is commonly used in galvanizing processes to prevent rusting of steel. Arsenic, on the other hand, is a metalloid with atomic number 33, historically infamous for its toxicity but also important in various industrial applications. Though very different in behavior and application, they share this one unusual linguistic trait.

The Importance of Spelling in Scientific Nomenclature

Part of what made this clue tricky is how uncommon the final letter “C” is among chemical element names. Most end in “-ium,” “-ine,” “-on,” or “-gen,” reflecting Latin or Greek roots. Even elements with similar sounds, such as “aluminum” or “chromium,” do not fit the pattern required by the clue. For example, the element “nickel” may share phonetic similarities with “zinc,” but its spelling eliminates it from contention.

This means contestants had to work backwards—from the letter “C”—and mentally scan through the periodic table not for chemical properties or element groups, but simply for spelling. For viewers and players alike, it was a rare example of a Jeopardy clue where linguistic observation trumped scientific knowledge alone.

A Final Jeopardy That Tests Memory and Observation

The challenge here wasn’t about knowing complex properties or atomic numbers; it was about recalling the exact names of elements and recognizing the peculiarity in their spelling. That makes it a classic Jeopardy moment—rewarding not just scientific knowledge but mental agility and memory.

While many Final Jeopardy questions test depth in specific academic fields, this one was about breadth and precision. Anyone with a broad knowledge of the periodic table may have recalled zinc and arsenic quickly, but zeroing in on that shared final letter under time pressure was another matter entirely.

Wrapping Up a Week of Smart Play

As the game closed out the week, this clue served as a strong reminder that Jeopardy continues to find new ways to challenge its contestants. A category like Chemical Element Names might suggest a dry, science-heavy question, but this one turned into a spelling test with a scientific twist. It rewarded sharp recall, pattern recognition, and the kind of detailed thinking that has long defined success on the show.

Whether the players wagered big or played it safe, Friday’s Final Jeopardy clue demonstrated how even well-known facts can yield difficult questions when framed just right. Zinc and arsenic may be familiar to many, but they won’t be forgotten anytime soon—especially not by fans of Jeopardy.