Classification of Elements and Periodicity in Properties - Result Question 33

####33. The first ionization potentials (eV) of Be and B respectively are

[1998]

(a) 8.29,9.32

(b) 9.32,9.32

(c) 8.29,8.29

(d) 9.32,8.29

[1999]

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Solution:

  1. (d) First ionisation potential of Be is greater than boron due to following configuration 4Be=1s2,2s25B=1s2,2s22p1 Order of attraction of electrons towards nucleus 2s>2p, so more amount of energy is required to remove the electron in 2s-orbital in comparison to 2p orbital.


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