P. Bahadur Solutions for Chapter: Periodic Classification of Elements, Exercise 1: Exercise 1

Which property of the middle element in a Dobereiner's triad was said to be the average of that of the first and the third element?

How many elements were known at the time of Newlands? $\left(118/ 56\right)$

How many elements were known at the time of Mendeleev?

What is the common valency of elements in group $15$?

Name one element having $18$ electrons in its outermost shell. (Sodium / Carbon / Palladium)

In which ionic compound, the ratio of cation to anion is the greatest? (Caesium iodide / Caesium Fluoride)

Name the heaviest gaseous non-metal. (Oxygen/ Carbon dioxide/ Radon)

Name the element with electronegativity next to fluorine. (Nitrogen / Oxygen / Bromine)