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Từ điển Oxford Advanced Learner 8th
proton
pro·ton [proton protons] BrE [ˈprəʊtɒn] NAmE [ˈproʊtɑːn] noun (physics)
a very small piece of matter (= a substance) with a positive electric charge that forms part of the ↑nucleus (= central part) of an atom
see also ↑electron, ↑neutron
Word Origin:
1920s: from Greek, neuter of prōtos ‘first’.
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