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An Intiative by Sri Chaitanya
a
gallium and germanium
b
aluminium and silicon
c
iron and sulphur
d
proton and silicon
answer is A.
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Detailed Solution
Gallium and germanium were not discovered at the time when Mendeleev proposed his periodic table.Mendeleev named these elements as eka-aluminium and eka-silicon because he believed that they would show similar properties as aluminium and silicon respectively.