( ( ( ( ( The ( noble ( gas atoms ) ) ) , ) ( ( like atoms ) ( in ( most groups ) ) ) ) , ) ( ( ( ( increase steadily ) ( in ( ( atomic radius ) ( from ( one period ) ) ) ) ) ( to ( ( the next ) ( due ( to ( ( the ( increasing number ) ) ( of electrons ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ noble) (NN gas) (NNS atoms)) (, ,) (NP (NP (JJ like) (NNS atoms)) (PP (IN in) (NP (JJS most) (NNS groups)))) (, ,)) (VP (VBP increase) (ADVP (RB steadily)) (PP (IN in) (NP (NP (JJ atomic) (NNS radius)) (PP (IN from) (NP (CD one) (NN period))))) (PP (TO to) (NP (NP (DT the) (JJ next)) (ADJP (JJ due) (PP (TO to) (NP (NP (DT the) (VBG increasing) (NN number)) (PP (IN of) (NP (NNS electrons))))))))) (. .)))
The noble gas atoms, like atoms in most groups, increase steadily in atomic radius from one period to the next due to the increasing number of electrons.
(ROOT (S (PP (IN Within) (NP (DT a) (NN substance))) (, ,) (NP (NP (NNS atoms)) (SBAR (WHNP (WDT that)) (S (VP (VP (VBP collide) (ADVP (RB frequently))) (CC and) (VP (VBP move) (ADVP (RB independently)) (PP (IN of) (NP (CD one) (DT another)))))))) (VP (VBP are) (ADJP (ADJP (RBS most) (JJ likely)) (PP (IN in) (NP (DT a) (NN gas)))))))