( Anions ( ( are ( ( larger ( in ( size ( than ( their ( parent atoms ) ) ) ) ) ) ( because ( they ( ( ( ( ( have ( ( ( one or ) more ) ( additional electrons ) ) ) , ) but ) ( without ( an ( additional proton ) ) ) ) ( in ( the ( nucleus ( to ( help ( moderate ( the size ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Anions)) (VP (VBP are) (ADJP (ADJP (JJR larger) (PP (IN in) (NP (NP (NN size)) (PP (IN than) (NP (PRP$ their) (NN parent) (NNS atoms)))))) (SBAR (IN because) (S (NP (PRP they)) (VP (VP (VBP have) (NP (QP (CD one) (CC or) (JJR more)) (JJ additional) (NNS electrons))) (, ,) (CC but) (PP (IN without) (NP (DT an) (JJ additional) (NN proton))) (PP (IN in) (NP (DT the) (NN nucleus) (S (VP (TO to) (VP (VB help) (NP (JJ moderate) (DT the) (NN size)))))))))))) (. .)))
Anions are larger in size than their parent atoms because they have one or more additional electrons, but without an additional proton in the nucleus to help moderate the size.
(ROOT (S (NP (NNS Electrons)) (ADVP (RB always)) (VP (VBP result) (PP (IN in) (NP (NP (DT an) (NN anion)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (ADJP (ADJP (JJR larger)) (PP (IN than) (NP (DT the) (NN parent) (NN atom)))))))))) (. .)))