Mendeleev periodic table [closed]








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![enter image description here](https://i.stack.imgur.com/3po9a.png)
Mendeleev accurately predicted the properties of gallium(eka aluminium). In his justification of properties he says(according to image given) the melting point of the element would be low. What could have been his insight considering the fact that melting points of aluminium and indium are 660.3°C and 156.6°C respectively?


