railway RRB Group D Mock Test Series 2024-25 General Science Chemistry Basic Concepts of Chemistry

ପରମାଣୁ ମୁଖ୍ୟତଃ କେଉଁଥିରେ ତିଆରି ହୋଇଥାଏ 

1
ନ୍ୟୁଟ୍ରନ
2
ପ୍ରୋଟନ
3
ଇଲେକ୍ଟ୍ରନ
4
ପ୍ରୋଟନ, ଇଲେକ୍ଟ୍ରନ ଏବଂ ନ୍ୟୁଟ୍ରନ
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