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Negatively charged particle with spin 1/2. A component of mundane terrestrial matter, and part of all neutral atoms and molecules. It has a mass about 1/1800 that of a proton. Its antiparticle is the positron.

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What proved Conventional sense wrong?

As a corollary of this question, why do we say that electrons have negative charge? Is it a question of convention or is there some deeper knowledge that implies them to be negative? …
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