جميع المواضيع المتعلقة بـ ‘table’

 

Long form or Modern form of periodic table

Long form or Modern form of periodic table

The modem form of period table is based on increasing order of atomic number. General features of the table is as follows:

1 –  There are 18 vertical columns which arc called groups. They are numbered in the old form by IA, IB, IIA, IIB, … VIIA, VIIB VIII and 0 (zero) and in the new…

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Mendeleev’s periodic law

Mendeleev’s periodic law

Mendeleev gave a periodic law in 1869. According to Mendeleev’s periodic law, the properties, of elements are periodic functions of their atomic masses. He found that if the elements are arranged in the order of increasing atomic masses, then the properties of elements are repeated after regular intervals or periods.

Important features of Mendeleev’s periodic table:

1 – The table…

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الجدول الدوري 2018 Periodic Table ( لوحة كبيرة قابلة للتنزيل)

الجدول الدوري 2018 Periodic Table

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The Periodic Table

Elements can be grouped into classes according to the chemical compounds they form. If the elements are written in a table in order of increasing atomic weights, they fall naturally into a series of columns, with members of a given chemical group in the same column. This is called the periodic table of the elements.The term periodic means recurring at regular intervals. The original periodic tables were…

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بورون

بورون Boron :

عنصر شبه فلز رمزه الكيميائي B ، هشّ، عدده الذري 5.  يقع البورون في المجموعة الثالثة عشر من الجدول الدوري . فقد عرفت مركّبات البورون، وخصوصا البوراكس ( البورق )  منذ وقت مبكّر و تحتاجه النباتات بكميات قليلة جدا لعمليات النمو و…

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