Question

In Mendeleev ′ s Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the perioidc table later
(a) Germanium
(b) Chlorine
(c) Oxygen
(d) Silicon

NCERT Class X
Science - Exemplar Problems

Chapter_Periodic Classification of Elements

Answer 1

germainum and siulicom (ekasilicon, ekaaluminium respecctively

Answer 2

Answer:

A

Explanation:

In 1869, after Newlands Octave Law was rejected, Mendeleev Periodic table was introduced. In this periodic table, elements were arranged on the basis of their atomic masses. A few gaps were left for the elements to be discovered later. Later, Gallium (Ga) and Germanium (Ge) were found that had same properties as eka–aluminum and eka–silicon, respectively.