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Priyanka Tomar • 15.25K Points
Tutor I Science
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Q. प्रत्येक आवर्त का प्रथम सदस्य होता है ?

(A) एक अक्रिय गैस
(B) एक क्षार धातु
(C) एक उपधातु
(D) एक हैलोजन
Correct Answer - Option (B)

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