engineering recuitment BARC Stipendiary Trainee Category II 2023 Mock Test General Science Chemistry Classification of Elements and Periodicity in Properties

निम्न में से कौन सा सबसे स्थिर तत्व है?

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हाइड्रोजन
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लेड
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ऑक्सीजन
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यूरेनियम
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