Per NCERT §3.2 + Table 3.3, Mendeleev predicted the existence of 'Eka-aluminium' and 'Eka-silicon' — which later turned out to be which elements?
AGallium (Ga) and Germanium (Ge)
BBoron and Carbon
CThallium and Lead
DIndium and Tin
Answer & Solution
Correct answer: A. Gallium (Ga) and Germanium (Ge)
Per NCERT §3.2 Table 3.3, eka-Al = Ga; eka-Si = Ge. Mendeleev left gaps + correctly predicted their properties.
Related questions
The most electronegative element on the periodic table is:Among Li, Na, K, Cs, the element with the highest first ionisation enthalpy is:Across a period from left to right, atomic radius generally:The modern periodic law arranges elements in order of:Per NCERT §3.3 note, how many naturally occurring elements does the Periodic Law currentlyPer NCERT Table 3.5, the IUPAC OFFICIAL name + symbol for Z = 104 is which?Per NCERT Problem 3.1, the IUPAC systematic name + symbol for the element with atomic numbPer NCERT Table 3.4, in IUPAC systematic nomenclature for Z > 100, what are the digit root