“ During the next 15 years, ” explains Encyclopedia Americana, “the discovery of gallium, scandium and germanium, whose properties closely matched those predicted by Mendeleyev, established the validity of the periodic table and the fame of its author. ”
एन्सायक्लोपीडिया अमेरिकाना कहती है “अगले 15 सालों में गैलियम, स्कैंडियम और जर्मेनियम की खोज हुई ।