defence exam Agniveer Army GD Mock Test Series 2025 General Science Chemistry Classification of Elements and Periodicity in Properties

নিম্নলিখিত কোনটি কোনো নোবেল গ্যাসের ইলেকট্রন বিন্যাস নয়?

1
2, 8, 18, 8
2
2, 8, 18, 2
3
2, 8
4
2, 8, 18, 18, 8
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