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Jean Stas
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<p>Jean Servais Stas (21 August 1813 – 13 December 1891) was a <a href="/facts/Belgium/YKuMXP5j">Belgian</a> analytical <a href="/facts/Chemist/N09K7Bdm">chemist</a> who accurately measured the <a href="/facts/Atomic_weight/A3vbuz2n">atomic weight</a> of <a href="/facts/Carbon/ukrgQexo">carbon</a>. </p>