العنـــاصــر : ( فلــــزات / لا فلــــزات )

[السيد سليم]

العنـــاصــر : ( فلــــزات / لا فلــــزات )



* العناصر تقسم إلى مجموعتين هما :


1- الفلــزات
2- اللافلــــزات






الفلزات

لها بريق معدنى
جيد التوصيل للحرارة
جيدة التوصيل للكهرباء
قابله للطرق والسحب والثنى
درجة انصهار عالية
جميعها صلب ماعدا الزئبق
أمثلة
حديد / نحاس / ألومنيوم / ذهب / الزئبق
فضة


اللافلزات
ليس لها بريق معدنى
رديئة التوصيل للحرارة
رديئة التوصيل ماعدا الكربون
غير قابله للطرق والسحب والثنى
درجة انصهار منخفضة
قد تكون صلبة مثل الكربون أو سائلة مثل البروم أو غازية مثل الأكسجين .
الكربون ( الجرافيت ) الفوسفور / الكلور البروم / الكبريت / الأكسجين / اليود


أهميــة الفــلزات





الحديد يستخدم فى صناعة الكبارى وهياكل السيارات وأعمدة الإنارة .

الألومنيوم يستخدم فى صناعة أوانى الطهى لأنه جيد التوصيل للحرارة .

الذهب والفضة تستخدم فى صناعة الحلى ، لأن الذهب أكثر العناصر قابلية للطرق .

الزئبق يستخدم فى صناعة الترمومترات ، لأنه جيد التوصيل للحرارة .


أهميــة اللافلزات




الكربون ( الجرافيت ) يستخدم فى صناعة الأقطاب الموجبة لأعمدة الجافة لأنه جيد التوصيل للكهرباء.

الأكسجين يستخدم فى إسعاف المرضى وفى أسطوانات الغوص تحت الماء وفى عمليات اللحام.

الماس يتكون من ذرات كربون .

[السيد سليم]

الى اللقاء في درس قادم

[MohammeD el_SadaT]

جزاك الله خيراً
و
جعله الله لك فى ميزان حسناتك أستاذى الفاضل

[السيد سليم]

جزاك الله خيراً

و

جعله الله لك فى ميزان حسناتك أستاذى الفاضل


شكرا لمشاركتك الرقيقة

[السيد سليم]

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أخي الكريم ..
العلم بحر لا ساحل له..
لذا نظل نطلبه (حتى إن كنا أساتذة ) إلى آخر يوم في عمرنا..
والعلم لا ينقاد لمتكبر وإنما يسلس لكل راغب فيه منقاد إليه..
لذا نحن هنا ( وأنت والأخوة معنا ) طلاب علم ننهله ممن هم أعلم منا..وأساتذة لمن يحتاجوننا ..
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السلام عليكم ورحمة الله وبركاته


اهلا بكم جميعا اخواني واخواتي


نعلم جميعا بان المنتدي هو مكان لتبادل المنفعة ولكي نفيد ونستفيد


من فضلك ساهم بقدر المستطاع واجعل دورك فعال بالمنتدي


على الاقل قم بشكر الشخص الذي استفد من موضوعه


فشكرك له يشعل حماسه ليفيدك ويساعدك اكثر ويخرج اقصي ما عنده




اخواني واخواتي جميعا:


- ساعد من يحتاج وانت فى مقدرتك مساعدته فربما يكون العضو الذي تساعده اليوم هو من سيساعدك غداً.


- ابدأ بما تعرفه وتجنب السلبية والكسل.


- تذكر دائماً كم أخذت وكم من المفترض ان تعطي في المقابل.


- اذا كنت استفد من الموضوع فسوف تستفيد اكثر اذا تفاعلت مع الموضوع.


- اندمج معنا فنحن جميعا اسرة واحدة عربية من جميع البلدان متعاونة ونعمل يد واحدة ونرحب بانضمام اي فرد جديد الى اسرتنا.


- نعمل جميعا على نشر الفائدة فشارك في هذا العمل العظيم ولا تكتفي بالمشاهدة فقط.





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اثبت وجودكلا تقرأ وترحل



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سيأتي يوم ....
ينظر الجميع لإسمك ليجدوا بجانبه( غير متصل )
ستتوقف مشاركاتك عند عدد
معين لن تكون قادرا على أن تعدل
أو تعتذر على ما فعلته يوما لمن
أخطأت في حقهم فأنت لست معنا إنك
هناك في حفرة ضيقة رحلت عنا
ولم يتبقى لنا سوى ما سطرته
لنا يداك ..!!حاول بسرعة أن تشارك في الخير
أن تقدم صدقة جارية
علم ينتفع به
أن تغير وتعدل
لأنك ببساطةأنت الآن ......... "متصل" ..!

[عجاج57]

بارك الله لك

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