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
물질의 원자식은 그 물질의 화학적 성질을 나타냅니다.Muljil-ui wonjasik-eun geu muljil-ui hwahakjeok seongjil-eul natanabnida.The atomic formula of a substance indicates its chemical properties.