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Chemistry 11 Online
OpenStudy (anonymous):

how did mendeleev predict the properties of the elements that belongs to the blanks in periodic table

OpenStudy (btaylor):

He predicted their atomic masses by averaging those around them. EX: Germanium (Element 32) Its atomic mass is roughly the average of the elements above and below (Si and Sn), even though it wasn't discovered yet. And it reacted similarly.

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