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Q.900 : इलेक्ट्रोन की खोज किसने की थी?
(a) ई. गोल्डस्टीन
(b) जे. जे. थोमसन
(c) अर्नेस्ट रदरफोर्ड
(d) जे. चैडविक
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जे. जे. थोमसन
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