|contextualWO||Дата: Вторник, 03.09.2013, 17:08 | Сообщение # 1|
|What is a pure element in chemistry? I would be very helpful if any person can reply to that question. I'm trapped with this problem for very last 7 days and I'm not able to locate homes solution for that issue. Any response will be hugely appreciated. Thank you quite much and have a great day. Apologies for my weak english language. |
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