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Continue to Chatعنصر الإربيوم ( Erbium ) و رمزه ( Er ) https://eduschool40.blog/%d8%b9%d9%86%d8%b5%d8%b1-%d8%a7%d9%84%d8%a5%d8%b1%d8%a8%d9%8a%d9%88%d9%85-erbium-%d9%88-%d8%b1%d9%85%d8%b2%d9%87/
عنصر الإربيوم ( Erbium ) و رمزه ( Er ) https://eduschool40.blog/%d8%b9%d9%86%d8%b5%d8%b1-%d8%a7%d9%84%d8%a5%d8%b1%d8%a8%d9%8a%d9%88%d9%85-erbium-%d9%88-%d8%b1%d9%85%d8%b2%d9%87/