railway RRB Group D Mock Test Series 2024-25 General Science Chemistry Chemical Bond and Molecular Structure

ପରମାଣୁର ପରମାଣୁ ଓଜନ ର କାରଣ କଣ -

1
ପ୍ରୋଟନ୍ ଏବଂ ନ୍ୟୁଟ୍ରନ୍ 
2
ଇଲେକ୍ଟ୍ରନ୍ ଏବଂ ନ୍ୟୁଟ୍ରନ୍ 
3
ପ୍ରୋଟନ୍ 
4
ପ୍ରୋଟନ୍, ଇଲେକ୍ଟ୍ରନ୍, ନ୍ୟୁଟ୍ରନ୍ 
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