railway RRB Group D Mock Test Series 2024-25 General Science Chemistry Classification of Elements and Periodicity in Properties

खालीलपैकी कोणत्या मूलद्रव्याचा अणुक्रमांक 87 आहे?

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फ्रान्सिअम
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सिझियम
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लिथियम
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रुबिडियम
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