Question

The first four ionisation energy values of an element are 191, 578, 872 and 5962 kcal. The number of valence electrons in the element is

Solution

Correct option is

3

Since, the IVth IE is very high, ie, electron is to be removed from stable configuration, thus it has 3 valence electrons. 

SIMILAR QUESTIONS

Q1

Which has the smallest size?

Q2

The correct order of radii is

Q3

The correct order of ionic radius is

Q4

The bond length or LiF will be

Q5

The ionic radius of ‘Cr’ is minimum in which of the following compounds?

Q6

The incorrect statement among the following is

Q7

Which ionisation potential (IP) in the following equations involves the greater amount of energy?

Q8

Which one of the following elements has the highest ionisation energy?

Q9

In the Periodic Table, going down in the fluorine group

Q10

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?