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"Elements" The Mystery of Material Composition PPT Courseware 5
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40 pages of light blue tree-shaped PPT chart elements
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"Classification of Elements and Matter" PPT courseware of elements and the world of matter (an important mixture in Lesson 2 - colloid)
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"Atomic Structure and the Periodic Table of Elements" PPT of the Periodic Law of the Elements in the Structure of Matter (Atomic Structure and the Properties of Elements in the 2nd Class)
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2021-12-24 14:10:07
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