Teaching EMRS JSA (Junior Secretariat Assistant) Mock Test Series 2023 General Science Chemistry Classification of Elements and Periodicity in Properties

खालीलपैकी कोणत्या घटकाचा अणुक्रमांक 7 आहे?

1

बेरिलियम

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नायट्रोजन

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बोरॉन

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अ‍ॅल्युमिनियम

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