SSC SSC GD Constable 2025 Mock Test Series General Science Chemistry Basic Concepts of Chemistry

इलेक्ट्रॉन चा शोध ____ ने लावला होता.

1

जे जे थॉमसन

2

जॉन डाल्टन

3

जेम्स चाडविक

4

रदरफोर्ड

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