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JEE MAIN - Chemistry Hindi (2017 (Offline) - No. 23)

वह ग्रुप जिसमें समइलेक्ट्रॉनी स्पीशीज हैं, है :
O2- , F- , Na+, Mg2+
O2- , F- , Na, Mg2+
O- , F- , Na+, Mg2+
O- , F- , Na, Mg+

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