1- Periodicity of elements and their properties
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11- Attempts of elements classification Part 1
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21- Attempts of elements classification Part 2
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31- Attempts of elements classification Quiz
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42- Graduation of elements properties in the modern periodic table Part 1
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52- Graduation of elements properties in the modern periodic table Part 2
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62- Graduation of elements properties in the modern periodic table Part 3
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72- Graduation of elements properties in the modern periodic table Quiz
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83- Main groups in the modern periodic table Part 1
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93- Main groups in the modern periodic table Part 2
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103- Main groups in the modern periodic table Quiz
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114- Water Part 1
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124- Water Part 2
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134- Water Quiz
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14Unit Exam
2- The atmosphere and protecting the planet earth
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151- The atmospheric layers Part 1
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161- The atmospheric layers Part 2
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171- The atmospheric layers Part 3
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181- The atmospheric layers Quiz
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192- Erosion of ozone layer and Global warming Part 1
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202- Erosion of ozone layer and Global warming Part 2
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212- Erosion of ozone layer and Global warming Quiz
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22Unit Exam
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