Question

Which of the following pairs of species have nearly same size?

Solution

Correct option is

Rb+, O2– & Li+, Mg2+  

Li and Mg show diagonal relationship, thus have same size. Ionic radii of O and Rb are not similar. 

SIMILAR QUESTIONS

Q1

In the Periodic Table, going down in the fluorine group

Q2

The Ist IEs of four consecutive elements present in the second period of Periodic Table are 8.3, 11.3, 14.5 and 13.6 eV respectively. Which of these is the IE of nitrogen?   

Q3

Which of the following transition involves maximum amount of energy?

Q4

 

The formation of the oxide ion O2–(g) requires first an exothermic and then an endothermic step as shown below  

               

                    

This is because 

Q5

The electronic configuration of four elements are given below. Which element does not belong to the same family?

Q6

The least stable ion among the following is

Q7

Ist and IInd IE of Mg are 7.646 and 15.035 eV respectively. The amount of energy needed to convert all the atoms of magnesium into Mg2+ ions present in 12 mg of magnesium vapours is [Given, 1 eV = 96.5 kJ mol–1]

Q8

Which of the following is the most electropositive element?

Q9

Which of the following sequence correctly represents the decreasing acidic nature of oxides?

Q10

The set representing the correct order of ionic radius is