( ( ( ( Nitrogen , ) ( ( an ( abundant heteroatom ) ) ( in ( drug molecules ) ) ) ) , ) ( ( ( ( ( has ( ( ( ( an ( atomic number ) ) ( of 7 ) ) and ) ( ( a ( molecular weight ) ) ( of 14.008 ) ) ) ) , ) and ) ( has ( ( 5 electrons ) ( in ( its ( valence shell ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Nitrogen)) (, ,) (NP (NP (DT an) (JJ abundant) (NN heteroatom)) (PP (IN in) (NP (NN drug) (NNS molecules)))) (, ,)) (VP (VP (VBZ has) (NP (NP (NP (DT an) (JJ atomic) (NN number)) (PP (IN of) (NP (CD 7)))) (CC and) (NP (NP (DT a) (JJ molecular) (NN weight)) (PP (IN of) (NP (CD 14.008)))))) (, ,) (CC and) (VP (VBZ has) (NP (NP (CD 5) (NNS electrons)) (PP (IN in) (NP (PRP$ its) (JJ valence) (NN shell)))))) (. .)))
Nitrogen, an abundant heteroatom in drug molecules, has an atomic number of 7 and a molecular weight of 14.008, and has 5 electrons in its valence shell.
(ROOT (S (NP (NNP Nitrogen)) (VP (VBZ has) (NP (CD 5) (JJ valence) (NNS electrons))) (. .)))