( ( ( ( ( The ( element symbol ) ) ( is ( in ( the center ) ) ) ) and ) ( ( ( ( as ( many ( as four ) ) ) groups ) ( of ( two electrons ) ) ) ( are ( shown ( as ( dots ( ( ( ( above , ) below ) , ) ( to ( ( ( the ( ( right and ) left ) ) ( of ( the ( element symbol ) ) ) ) ( to ( show ( the ( valence electrons ) ) ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT The) (NN element) (NN symbol)) (VP (VBZ is) (PP (IN in) (NP (DT the) (NN center))))) (CC and) (S (NP (NP (QP (RB as) (JJ many) (IN as) (CD four)) (NNS groups)) (PP (IN of) (NP (CD two) (NNS electrons)))) (VP (VBP are) (VP (VBN shown) (PP (IN as) (NP (NP (NNP dots)) (PP (IN above) (, ,) (ADVP (RB below)) (, ,) (PP (TO to) (NP (NP (DT the) (NN right) (CC and) (NN left)) (PP (IN of) (NP (DT the) (NN element) (NN symbol))) (S (VP (TO to) (VP (VB show) (NP (DT the) (JJ valence) (NNS electrons))))))))))))) (. .)))
The element symbol is in the center and as many as four groups of two electrons are shown as dots above, below, to the right and left of the element symbol to show the valence electrons.
(ROOT (S (NP (NNP Carbon)) (VP (VBZ has) (NP (CD four) (JJ valence) (NNS electrons))) (. .)))