( ( ( Group ( IA ( VIA ( VIIA ( VIIIA ( Lithium ( Oxygen ( Fluorine ( Neon ( Sodium ( Electron Configurations ) ) ) ) ) ) ) ) ) ) ) ( for ( Selected Elements ) ) ) ( ( As ( you ( can ( see ( in ( ( the table ) ( ( above ( , ( ( while ( sodium ( has ( ( ( three ( electron shells ) ) and ) ( lithium two ) ) ) ) ) , ) ) ) ( ( the point ) ( they ( share ( in common ) ) ) ) ) ) ) ) ) ) ) ( ( is ( that ( both ( have ( ( one electron ) ( in ( their ( outermost ( electron shell ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (NP (NNP Group) (NNP IA) (NNP VIA) (NNP VIIA) (NNP VIIIA) (NNP Lithium) (NNP Oxygen) (NNP Fluorine) (NNP Neon) (NNP Sodium) (NNP Electron) (NNPS Configurations)) (PP (IN for) (NP (NNP Selected) (NNPS Elements)))) (SBAR (IN As) (S (NP (PRP you)) (VP (MD can) (VP (VB see) (PP (IN in) (NP (NP (DT the) (NN table)) (PP (IN above) (PRN (, ,) (SBAR (IN while) (S (NP (NN sodium)) (VP (VBZ has) (NP (NP (CD three) (NN electron) (NNS shells)) (CC and) (NP (NN lithium) (CD two)))))) (, ,)) (NP (NP (DT the) (NN point)) (SBAR (S (NP (PRP they)) (VP (VBP share) (PP (IN in) (NP (JJ common)))))))))))))) (VP (VBZ is) (SBAR (IN that) (S (NP (DT both)) (VP (VBP have) (NP (NP (CD one) (NN electron)) (PP (IN in) (NP (PRP$ their) (JJ outermost) (NN electron) (NN shell)))))))) (. .)))
Group IA VIA VIIA VIIIA Lithium Oxygen Fluorine Neon Sodium Electron Configurations for Selected Elements As you can see in the table above, while sodium has three electron shells and lithium two, the point they share in common is that both have one electron in their outermost electron shell.
(ROOT (S (NP (NNP Lithium)) (VP (VBZ has) (NP (CD three) (NNS electrons))) (. .)))