1.

Which of the following statement is incorrect?(1) lonisation energy of potassium is less than sodium and lithium.(2) Xe does not have least ionisation energy in its group.(3) lonisation energy of gallium is more than that of atomic number 30(4) lonisation energy of atomic number 38 element is greater than atomic number 37 element

Answer»

Correct option is (3) lonisation energy of gallium is more than that of atomic number 30

\(\underset{30}{Zn} = [Ar] 3d^{10} CS^2\)

\(\underset{31}{Ga} = [Ar]3d^{10} 4S^24P^{1}\)

IE of Zn > IE of Ga.



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