railway DFCCIL MTS 2025 Mock Test Series General Science Chemistry Structure of Atom

इलेक्ट्रॉनचा शोध सर्वप्रथम कोणी लावला?

1
जेम्स चॅडविक
2
डी. रुदरफोर्ड
3
जे.जे. थॉमसन
4
जे. केप्लर
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