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2. 물질의 구성

아리스토텔레스는 4원소변환설을 주장했다.
18족 원소들은 다른 원소와 잘 반응한다.
불꽃반응을 통해 모든 원소를 구별할 수 있다.
원자는 원자핵과 전자로 구성된다.
원자가 전자를 잃으면 양이온이 된다.
Created by: 100001842478354