المادة وتركيبها: الفلزات

The video tutorial explains the classification of metals based on their chemical reactivity, particularly their ability to react with oxygen. Metals are divided into three groups: highly reactive, moderately reactive, and weakly reactive. Highly reactive metals like sodium and potassium lose their shine quickly and are stored under kerosene. Moderately reactive metals such as aluminum, iron, and copper form a layer of rust when exposed to air for days. Weakly reactive metals, including gold, silver, and platinum, are resistant to oxidation and are used in jewelry making.

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