A) Ge
B) Sc
C) As
D) Br
Correct Answer: B
Solution :
Sc, Ge, As and Br all the four elements are placed in 4th period in the periodic table. In a period, the ionisation energy increases from left to right and here is no exception. Sc has minimum ionisation energy among these. (It is a general conclusion that ionisation energy of d-block elements are found greater than s-block elements but lower than p-block elements).
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