Thus beryllium, combining weight 4.6, was given the valency 3 because it was chemically similar to aluminium.
This gave an atomic weight of 13.8, placing it between carbon and nitrogen where there was no space.
The worlds first view of Mendeleevs Periodic Table an extract from Zeitschrift fϋr Chemie, 1869.
Click here for a translation Why is Mendeleev considered to be the father of the Periodic Table whilst others, such as Newlands, Meyer and De Chantcourtois are considered to be also-rans?
By correcting the relative atomic mass he put the element in the correct place.
At the time, relative atomic masses (then called atomic weights) were laboriously determined using the formula atomic weight = equivalent weight x valency The combining (or equivalent) weights (see Problems with relative atomic masses) were generally accurate but sometimes an element was given the wrong valency.
Shortly after, his ideas were presented to the Russian Physico-chemical Society.However de Boisbaudran's value for gallium's density (4.9 g/cm) differed from Mendeleev's prediction.Mendeleev told the Frenchman, who re-measured the density to find Mendeleev was right!One such person was Russian chemist Dmitri Mendeleev.
Incidentally, although he is often regarded as the father of the Periodic Table, Mendeleev himself called his table, or matrix, the Periodic System.First only 60 elements had been discovered (we now know of over 100) and second some of the information about the 60 was wrong.
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