01:27:45
Iron element and Alloys class7
32:46
General properties of first transition series part two class 6
50:54
General properties of first transition series elements part one class 5
26:43
oxidation states of first transition series
30:47
electronic configuration of first transition series class 3
42:46
Economic importance of the first transition series class 2
25:26
Transition elements class 1
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قناة تعليمية لمادة الساينس science والكميستري chemistry
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