http://en.wikipedia.org/wiki/Mendeleev%27s_predicted_elements
It says he predicted more than three.
He formulated the Periodic Law and revised and predicted the Periodic Table of Elements in some important ways.
63 elements were in Dmitri Mendeleev's First periodic table 63 elements were in Dmitri Mendeleev's First periodic table
Dmitri Mendeleev first periodic table is called Mendeleev's periodic table. Elements are arranged according to atomic mass.
Dmitri Mendeleev was a Russian inventor and chemist. He is perhaps best known for his version of the periodic table. This helped him predict properties of elements which had not yet been discovered at that time.
Dmitri Mendeleev
Dmitri Mendeleev.
The Periodic Table of Elements
Dmitri Mendeleev
Dmitri Ivanovich Mendeleyev. Another spelling of his name is Dmitri Ivanovich Mendeleev.
Dmitri Ivanovich Mendeleev (1834 - 1907) is considered the father of the periodic table.
Dmitri Mendeleev made the periodic table. He is credited as being the creator of the first version of the periodic table of elements. Using the table, he predicted the properties of elements yet to be discovered.
Dmitri Mendeleev is credited with being the first scientist to arrange and classify elements into a chart. He was a Russian chemist who lived from 1834 to 1907.