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science & technology Online Quiz - 263
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Rg
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A
Roentgenium
💡 Explanation:
Rg is roentgenium, named after Wilhelm Roentgen who discovered X-rays. 'Rogernium' is fictional, and Rutherfordium is Rf. Silver is Ag. Roentgenium is a synthetic transition metal in the same group as copper, silver, and gold.