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

ଇଲେକ୍ଟ୍ରନ୍ ପ୍ରଥମେ ________ ଙ୍କ ଦ୍ୱାରା ଚିହ୍ନଟ ହୋଇଥିଲା । 

1
ଜେମ୍ସ ଚାଡୱିକ୍ 
2
ଡି. ରଦରଫୋର୍ଡ
3
ଜେଜେ ଥମସନ 
4
ଜେ କେପଲର୍ 
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