물질을 이루는 원소 찾기 by Hanhan Lee https://padlet.com/hellohello0926/7tidx45nq4hgywys en-us 2022-03-02 14:45:20 UTC 2022-03-02 14:48:34 UTC hello@padlet.com 예 : 2901 이보화 hellohello0926 https://padlet.com/hellohello0926/7tidx45nq4hgywys/wish/2073714345 산소]]> 2022-03-02 14:48:34 UTC https://padlet.com/hellohello0926/7tidx45nq4hgywys/wish/2073714345