“Particle first confirmed in 1955 at Berkeley”

Here is the verified answer to the Wall Street Journal Crossword clue “Particle first confirmed in 1955 at Berkeley”, last seen on September 10, 2026.

Answer hidden — reveal below

A????????N

A 10-letter across entry from the Thursday puzzle

The Answer

ANTIPROTON

The answer to “Particle first confirmed in 1955 at Berkeley” is ANTIPROTON

Letters10

DirectionAcross

PublishedSep 10, 2026

Letter analysis

The clue “Particle first confirmed in 1955 at Berkeley” appeared in the Wall Street Journal Crossword on Thursday, September 10, 2026 as a across entry. The verified answer is ANTIPROTON — a 10-letter word that begins with A and ends with N.

This answer contains 4 vowels and 6 consonants. Click through any related clue below to keep solving, or open the full answer key for the day from the link above.

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Frequently Asked Questions

What is the answer to “Particle first confirmed in 1955 at Berkeley”?

The answer to the Wall Street Journal Crossword clue “Particle first confirmed in 1955 at Berkeley” is ANTIPROTON — a 10-letter across entry from the September 10, 2026 puzzle.

How many letters is the answer?

ANTIPROTON has 10 letters — 4 vowels and 6 consonants.

Are these answers official?

WSJCrosswordAnswers.org is an independent reference site, not affiliated with the Wall Street Journal. We solve and verify each puzzle by hand before publishing.