関連ワード:  define isotopes with example class 11    define isotones with example class 11    define species with example class 11    define isobars with example class 11    define nucleophile with example class 11    define isomerism with example class 11    define genus with example class 11    define metamerism with example class 11    define oxidation with example class 11    define electrophile with example class 11