Class 10 science Chapter 3 धातु एवं अधातु Notes in hindi Chapter = 3 धातु एवं अधातु वर्तमान में 118 तत्व ज्ञात हैं । इनमें 90 से अधिक धातुऐं , 22 अधातुऐं और कुछ उपधातु हैं । धातु :- पदार्थ जो कठोर , चमकीले , आघातवर्ध्य , तन्य , ध्वानिक और ऊष्मा तथा विद्युत के सुचालक होते हैं , धातु कहलाते हैं । जैसे :- सोडियम ( Na ) , पोटाशियम ( K ) , मैग्नीशियम ( Mg ) , लोहा ( Fc ) , एलूमिनियम ( AI ) , कैल्शियम ( Ca ) , बेरियम ( Ba ) धातुऐं हैं । धातुओं के उपयोग :- धातुओं का उपयोग इमारत , पुल , रेल पटरी को बनाने में , हवाईजहाज , समुद्री जहाज , गाड़ियों के निर्माण में , घर में उपयोग होने वाले बर्तन , आभूषण , मशीन के पुर्जे आदि के निर्माण में किया जाता है । अधातु :- जो पदार्थ नरम , मलिन , भंगुर , ऊष्मा तथा विद्युत के कुचालक होते हैं , एवं जो ध्वानिक नहीं होते हैं अधातु कहलाते हैं । जैसे :- ऑक्सजीन ( O ) , हाइड्रोजन ( H ) , नाइट्रोजन ( N ) , सल्फर ( S ) , फास्फोरस ( P ) , फ्लूओरीन...
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