Above is Chemrocksium's current periodic table.  Vladimir Khrushchev, one of Boris Broflovski's (the chemist who figured out the elements' reactiveness) pupils, was able to measure each of the elements' relative atomic mass.  For his discoveries, Khrushchev was crowned Tri Lamb of the Year in 2003, an honor bestowed upon only the brightest scientists. 

    The organization of this table is based on multiples of two and three.  The elements in the first group are organized by increasing odd multiples of three, like 3, 9, 15, 21, etc., going down the group.  The second group is organized in the same fashion, but with even multiples of two instead, like 2, 4, 6, 8, etc.  The third group is organized by increasing prime numbers going down the group, like 1, 5, 7, 11, etc. 

    To some people, what Khrushchev did may seem pointless.  But those familiar with the development of the Chemrocksium periodic table will realize that properties from the first two drafts of the table still hold true for the current model.  The organization of the elements' reactiveness is exactly the same with only one discrepancy.  The names that were given to each group (dark, oxygen, and stoic) also held up for this table.  But the name "stoic" can be used in a numerical context here.  In the second table, the third group was called the stoic group because the elements in it didn't react to anything.  But in this case, it encompasses the elements with relative atomic masses of prime numbers, which can be considered stoic because their only factors are one and themselves.  It was for these very reasons that Vladimir Khrushchev was chosen as Tri Lamb of the Year.