( ( In ( a solid ) ) ( , ( ( the ( ( atoms and ) molecules ) ) ( ( are ( densely ( ( ( ( packed and ) held ) ( in place ) ) ( by ( intermolecular forces ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (DT a) (JJ solid))) (, ,) (NP (DT the) (NNS atoms) (CC and) (NNS molecules)) (VP (VBP are) (VP (ADVP (RB densely)) (VBN packed) (CC and) (VBN held) (PP (IN in) (NP (NN place))) (PP (IN by) (NP (NN intermolecular) (NNS forces))))) (. .)))
In a solid , the atoms and molecules are densely packed and held in place by intermolecular forces.
(ROOT (S (NP (NNS Solids)) (VP (VBP are) (VP (VBN categorized) (PP (IN by) (NP (NP (DT the) (NNS forces)) (VP (VBG holding) (NP (NP (DT the) (JJ individual) (NNS atoms)) (, ,) (NP (NNS ions)) (, ,) (CC or) (NP (NNS molecules))) (ADVP (RB together))))))) (. .)))