8RB Group D 23-Sep-2018 Shift 1 Solved Paper

Question : 16 of 100

Marks: +1, -0

Who predicted the existence of some yet to be discovered elements on the basis of gaps in his periodic table?

Mendeleev
Dobereiner
Newlands
Mosely

Solution:

1869,

when Mendeleev proposed his periodic table, he noted gaps in the table and concluded that in these gaps belonged elements yet to be discovered. Based on other elements in the same group he predicted the existence of eka-aluminum, eka-boron and eka-silicon with respective atomic masses of

44,68,

and72. These elements were later named as gallium (Ga), scandium (Sc) and germanium (Ge).

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