ब्रह्माण्ड में कौन-सा तत्व सबसे प्रचुर मात्रा में है? Which element is the most abundant in the universe?

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ब्रह्माण्ड में कौन-सा तत्व सबसे प्रचुर मात्रा में है? Which element is the most abundant in the universe?