( Astatine ( ( ( forms ( covalent compounds ) ) ( with ( ( nonmetals , ) ( including ( hydrogen ( astatide ( HAt ( and ( carbon ( tetraastaide CAt4 ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Astatine)) (VP (VBZ forms) (NP (JJ covalent) (NNS compounds)) (PP (IN with) (NP (NP (NNS nonmetals)) (, ,) (PP (VBG including) (NP (NN hydrogen) (NN astatide) (NN HAt) (CC and) (NN carbon) (NN tetraastaide) (NNS CAt4)))))) (. .)))
Astatine forms covalent compounds with nonmetals, including hydrogen astatide HAt and carbon tetraastaide CAt4.
(ROOT (S (NP (NN Hydrogen) (NN chloride)) (VP (VBZ is) (NP (DT a) (JJ covalent) (NN compound))) (. .)))