state gov MP Excise Constable Mock Test Series 2025 General Science Chemistry Structure of Atom

ଆଧୁନିକ ପର୍ଯ୍ୟାୟ ସାରଣୀରେ ପ୍ରଥମ ଧାତବ ଉପାଦାନ କେଉଁଟି?

1
He
2
H2
3
Na
4
Li
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