defence exam Indian Coast Guard Assistant Commandant (GD/CPL) 2025 Test Series General Science Chemistry Structure of Atom

ବାମରୁ ଡାହାଣକୁ ପରମାଣୁ ସଂଖ୍ୟା ବୃଦ୍ଧି ଅନୁଯାୟୀ ନିମ୍ନଲିଖିତ ମଧ୍ୟରୁ କେଉଁଟି ଏକ ସଠିକ ଯୋଡି?

1
He, H
2
Na, Ne
3
Be, B
4
Ca, Cl
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