Classification of Elements and Periodicity in Properties - Result Question 30

####30. Which of the following order is wrong? [2002]

(a) NH3<PH3<AsH3 Acidic

(b) Li<Be< B < C - First IP

(c) Al2O3<MgO<Na2O<K2O Basic

(d) Li+<Na+<K+<Cs+Ionic radius

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Solution:

  1. (b) Along the period, I.P. generally increases but not regularly. Be and B are exceptions. First I.P. increases in moving from left to right in a period, but I.P. of B is lower than Be.


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