Which elements did Mendeleev leave spaces for in his periodic table?

Question

There are 3

Answer 1

Scandium, Germanium, Gallium

The true insight that informed Mendeleev's work was shown not just in what he had included in the Periodic Table, but also in what he had left out. He did not assume that all elements were known. Where there was a significant gap in atomic weights between the elements in the table, he left a gap in the table. He posited that there were undiscovered elements that existed in the gaps and even predicted the characteristics of three of them. He called these eka boron, eka aluminum, and eka silicon (eka being Sanskrit for "first"

But what Random Acts (below me) says is also an important point!

Answer 2

Actually, he left a lot of spaces because at the time he organized his table (1869), there were only 63 elements.

Here is his orginal table
http://chemlab.pc.maricopa.edu/PERIODIC/foldedtable.html
Here it is a little clearer..
http://www.aip.org/history/curie/1102full.gif

You can see that the arrangement of the elements is slightly different than that for a modern periodic table.
Here is a website that shows the development of the periodic table in very simple terms.
http://mooni.fccj.org/~ethall/period/period.htm (for kids).

Answer 3

um i can only remember 1 now- germanium which he referred to as eka silicon. maybe im mistaked

Answer 4

Hi. Was one helium?

Answer 5

i remember one of the noble gasses.
maybe also (K)