railway DFCCIL Junior Executive 2023 (CBT 1 & CBT 2) Mock Test General Science Chemistry Structure of Atom

खालील पैकी कोणता एक अवअणुकण नाही?

1
न्यूट्रॉन
2
प्रोटॉन
3
ड्यूटरॉन
4
इलेक्ट्रॉन
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