divalent vs chemical science

divalent is not a noun while chemical science is a noun.

Word	Noun	Adjective	Verb	Adverb
divalent	No	Yes	No	No
chemical science	Yes	No	No	No

divalent (noun)	chemical science (noun)
	the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions

divalent (adjective)	chemical science (adjective)
having a valence of two or having two valences