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
양자수는 전자의 에너지를 설명하는 데 사용됩니다.yangjasuneun jeondaui eneojireul seolmyeonghaneun de sayongdoemnida.The quantum number is used to describe the energy of an electron.