All I know is Dmitri Mendeleev organised his by atomic mass
2007-01-22 10:37:54 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
The current periodic table is complete as far as all naturally occuring elements go. Mendeleev's version was produced in 1871, long before we had the technology to test these. He was clever enough to leave gaps for undiscovered elements.
Mendeleevs table doesn't allow space for all the transition elements, actinides or lanthanides but it was a pretty good stab. Much better than the other atempts before him.
2007-01-22 11:12:08 · answer #1 · answered by Alasdair S 2 · 0⤊ 0⤋
The most striking difference between Mendeleev's first table and the modern periodic table was the fact that Mendeleev's first table was arranged in horizontal rows. After awakening from a brief nap that afternoon, he transposed his table into the collumns we are now familiar with. 2
2007-01-22 11:11:30 · answer #2 · answered by harphey m 1 · 0⤊ 0⤋
The modern table is organized by atomic number, which Mendeleev didn't know about. It's also more complete since he had to include gaps which represented elements that hadn't yet been discovered.
2007-01-22 10:43:33 · answer #3 · answered by hcbiochem 7 · 0⤊ 0⤋
Twillighter is wrong. Mendeleev actually arranged the elements in the periodic table in order of atomic number, not atomic mass.
2016-05-23 22:56:36 · answer #4 · answered by Anonymous · 0⤊ 0⤋