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

નીચેનામાંથી કયા તત્વનો પરમાણુ ક્રમાંક 7 છે?

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બેરિલિયમ

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નાઈટ્રોજન

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બોરોન

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એલ્યુમિનિયમ

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