NCERT Solution for Class 10 Science Chapter 5
Periodic Classification of Elements
NCERT Books for Session 2020-2021
CBSE Board and UP Board
Intext Questions
Page No-81
Questions No-1
Did Döbereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
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Yes, in second and third column of octave.
Yes two triads.
Döbereiner’s two triads exist in Newland’s Octaves.
Yes, Newland’s second and third column is contains Döbereiner’s trieds.
Yes, Dobereiner’s traiads exists in the columns of Newland’s Octaves.
Example – In the Dobereiner’s triads Lithium, Sodium and Potassium make a triad, and these elements also present in the same column of Newland’s Octaves as these have same properties.