How many elements were known when Mendeleev started his work? / जब मेंडलीफ ने अपना कार्य आरंभ किया, उस समय कितने तत्व ज्ञात थे? - www.studyandupdates.com

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How many elements were known when Mendeleev started his work? / जब मेंडलीफ ने अपना कार्य आरंभ किया, उस समय कितने तत्व ज्ञात थे?



How many elements were known when Mendeleev started his work? / जब मेंडलीफ ने अपना कार्य आरंभ किया, उस समय कितने तत्व ज्ञात थे?

  1. 136

  2. 29

  3. 63

  4. 47


Answer /  उत्तर :-63




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