The two elements for which Mendeleev left blank places in his original periodic table werea)Al, Gab)As, Sbc)Ga, Ged)Si, TiCorrect answer is option 'C'. Can you explain this answer?

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Class 10 Exam > Class 10 Questions > The two elements for which Mendeleev left bla...

The two elements for which Mendeleev left blank places in his original periodic table were

a)
Al, Ga
b)
As, Sb
c)
Ga, Ge
d)
Si, Ti

Correct answer is option 'C'. Can you explain this answer?

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The two elements for which Mendeleev left blank places in his original...

Though only 63, elements were known at the time when Mendeleev started his work, he left some places vacant for elements to be discovered later.
While developing his Periodic Table of the elements,he named aka-Aluminum to the element just below of Aluminium.
Mendeleev gave the name eka-Aluminium to a compound which contains aluminium, a mixture of aluminium and an unknown element.
The unknown element he predicted would have properties similar to those of aluminium and which have rare isotope of aluminium.
It was later discovered as Gallium with an atomic weight of 68 and atomic number of 31.
Germanium was named as Aka-Silicon first and was later discovered.
Germanium has atomic number 32 and an atomic weight of 72.

Hence, Mendeleev left the gaps for the elements with predicted atomic weight 68 & 72 respectively are discovered later as Gallium & Germanium.

Answered by Dr Manju Sen · View profile

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