The weight of the atom is not the only criterion; there are other considerations.
Periodic table of elements
Explaining the deviations in his periodic table from simple atomic weight order
1869
Found in 1 providers: grok
Cross Reference
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"The law of periodicity was a result of the accumulation of a large number of facts."
Controversial"The most important thing for a scientist is to be honest with himself and with others."
Strange & Unusual"I saw in a dream a table where all the elements fell into place as required."
Strange & Unusual"The structure of the elements is a matter of the internal structure of their atoms."
Strange & Unusual"The whole essence of science is to make predictions."
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