Q. Screening effect is not observed in

2275 285 ManipalManipal 2013Classification of Elements and Periodicity in Properties Report Error

A

$H e^{+}$

24%

B

$L i^{2 +}$

10%

C

$B e^{3 +}$

2%

D

all cases

64%

Solution:

$H e^{+}, L i^{2 +}$ and $B e^{3 +}$ each has one electron, hence no screening.