chromium vs atomic number 24

chromium and atomic number 24 both are nouns.

Word	Noun	Adjective	Verb	Adverb
chromium	Yes	No	No	No
atomic number 24	Yes	No	No	No

As nouns, chromium and atomic number 24 are synonyms defined as:

chromium and atomic number 24: a hard brittle multivalent metallic element; resistant to corrosion and tarnishing

Other synonyms of chromium include Cr.

chromium (noun)	atomic number 24 (noun)
a hard brittle multivalent metallic element; resistant to corrosion and tarnishing	a hard brittle multivalent metallic element; resistant to corrosion and tarnishing