Matrix Structure with Periods

Landing zone and camp can be seen in the center of this photograph taken from SS-Villwar orbiting spacecraft.


A sample grid, arrangment for the elements to be positioned
There are four columns shown here labeled A, B, C, & D<
And three rows or periods I, II, III

Remember: only ten elements where discovered, that means there are two spaces in this matrix.



Column A
Column B
Column C
Column D
Period I Selected element Selected element Selected element Selected element
Period II Selected element Selected element Selected element Selected element
Period III Selected element Selected element Selected element Selected element

These elements are place in this grid the way all the "Earth" elements are placed on the Periodic Table (you deduce how this is to be done).
And remember, there should be two spaces on your finished array.
The last question asks you to position these periods on the "Periodic Table of Elements", in other words, where would this matrix of elements fit on the real Periodic Table?

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