Answer:
In \[_{13}Al,\,2p\] should be filled first before filling of 3s starts.
Correct electronic configuration\[=1{{s}^{2}}\,2{{s}^{2}}\,2{{p}^{6}}\,3{{s}^{2}}3{{p}^{1}}\]
In \[_{5}B,\] total electrons = 5. Hence, \[E.C.=1{{s}^{2}}2{{s}^{2}}2{{p}^{1}}\]
In \[_{9}F,\] total electrons = 9. Hence, \[E.C.=1{{s}^{2}}\,2{{s}^{2}}\,2{{p}^{5}}\]
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