Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
무기성의 화합물은 일반적으로 금속으로 구성되어 있다.mugiseong-ui hwahapmul-eun ilbanjeogeuro geumseog-eulo guseongdoeeo itda.Inorganic compounds are generally composed of metals.