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First three ionisation energies (in kJ/m...

First three ionisation energies (in kJ/mol) of three representative elements are given below:
`{:("Element",IE_(1),IE_(2),IE_(3)),(P,495.8,4582,6910),(Q,737.7,1451,7733),(R,577.5,1817.2745):}`
then incorrect option is:

A

Q: alkaline earth metal

B

P: alkali metals

C

R: s-block element

D

They belong to same period

Text Solution

Verified by Experts

The correct Answer is:
C
R is p-block element, because difference between `IE_(2) and IE_(3)` is not very high as compared to between `IE_(1) and IE_(2)`, hence stable oxidation state of R will be higher than +2.
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