TPO16 Development of periodic Table - 英檢

10. It can be inferred from paragraph 3 that the significance of the
discovery of gallium was that it supported which of the following?
○The idea that aluminum was correctly placed in the periodic table
○Mendeleyev's prediction that eka-silicon would be discovered next
○The organizing principle of the periodic table
○The idea that unknown elements existed


Mendeleyev went further than Meyer in another respect: he predicted the
properties of six elements yet to be discovered. For example, a gap just
below aluminum suggested a new element would be found with properties
analogous to those of aluminum. Mendeleyev designated this element
"eka-aluminum" (eka is the Sanskrit word for "next") and predicted its
properties. Just five years later an element with the proper atomic mass was
isolated and named gallium by its discoverer. The close correspondence
between the observed properties of gallium and MendeleyeVs predictions for
eka-aluminum lent strong support to the periodic law. Additional support came
in 1885 when eka-silicon, which had also been described in advance by
Mendeleyev, was discovered and named germanium.


請問為什麼不是A 答案是C


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