railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) General Knowledge

ಕೆಳಗಿನ ಯಾವ ಧಾತುವು ಪರಮಾಣು ಸಂಖ್ಯೆ 12 ಅನ್ನು ಹೊಂದಿದೆ? 

1
Ca
2
O
3
He
4
Mg 
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