Multiple choice general knowledge science & technology Rg Roentgenium Rogernium Rutherfordium Silver Reveal answer Fill a bubble to check yourself A Correct answer 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.