1.

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:

Answer»

Q: alkaline earth metal
P: alkali metals
R: s-block element
They BELONG to same period

Solution :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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