Answer:
(i) The electronic
configurations of Be and B are
respectively:
\[Be\,\,\,\,1{{s}^{2}},2{{s}^{2}}\,\,\,\,\,\,\,\,\,\,\,;\,\,\,\,\,\,\,\,\,\,1{{s}^{2}},2{{s}^{2}}2{{p}^{1}}\]
In Be, the
electron is to be removed from 2s while in boron from \[2p\] energy shell. Since,
\[2s\]-electron is more strongly attracted by nucleus than \[2p\]-electron,
therefore, more energy is required for the removal of \[2s\]-electron than \[2p\]-electron.
Consequently, \[{{\Delta }_{i}}{{H}_{1}}\] of Be is higher than \[{{\Delta
}_{i}}{{H}_{1}}\]of B.
(ii) The
electronic configuration of nitrogen is \[1{{s}^{2}},2{{s}^{2}}2p_{x}^{1}2p_{y}^{1}2p_{z}^{1},\]
i.e., all the \[p\]-orbitals are singly occupied. It is thus a stable
configuration in comparison to oxygen which is not so stable
(unsymmetrical)
\[O\,\,\,\,\,\,\,\,\,(1{{s}^{2}},2{{s}^{2}}2p_{x}^{2}2p_{y}^{1}2p_{z}^{1})\]
As a result, the
removal of electron from nitrogen requires more energy than the removal of
electron from oxygen atom. Thus, \[{{\Delta }_{i}}{{H}_{1}}\] of N is higher
than \[{{\Delta }_{i}}{{H}_{1}}\] of oxygen.
In fluorine atom, the effective nuclear charge is higher
than oxygen. Thus,\[{{\Delta }_{i}}{{H}_{1}}\]of F is higher than \[{{\Delta
}_{i}}{{H}_{1}}\]of O.
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