شرح ساينس الصف الأول الاعدادي لغات - الفصل الدراسي الأول
شرح ساينس سادسة ابتدائي - ترم أول

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In This Part :
The energy levels
They are imaginary regions (places) around the nucleus in which the electrons move according to their energies.
-The maximum number of energy levels in the heaviest (largest) atoms is seven.
- The energy levels are arranged from the nucleus as follows :

- Each energy level can take a definite number of electrons.
- The number of electrons which saturates the first four energy levels can be calculated
from the relation 2n2 , where (n) is the number of the energy level.
Electronic configuration according to the relation 2n2 :
• The electrons are distributed in the 1st level "K" (the least energy), then the seco
nd and so on.


If the symbol of the element was :
- One letter : It is written in capital.
- Two letters : The first is written in capital and the second in small.
Some elements are common in their initial letters, so the second letter is taken to differentiate between them, like :
*Carbon (C) and Calcium (Ca) . * Sulphur (S) and Silicon (Si).
* Hydrogen (H) and Helium (He).

The element symbol is derived from its Latin name,
so that symbols of some elements differ from their names in English language.

بالتوفيق
مستر احمد الباشا