الأربعاء، 10 أغسطس، 2011

الكمياء بالانجليزى

Sublevel (d) has 5 orbitals.
2-   Sublevel (f) has 7 orbitals.
3-   Orbitals of the same sub level are equal in energy and shape.

Ex:  px = py = pz

4-   No of orbitals in each E. level = square order of E. level = n2.

1-         Spin Q. No (ms):
·         Detects the direction in which the electron spins around its axis during its rotation around the nucleus.
·         Each orbital can be saturated by 2 electrons, one electron spins around its axis clockwise while the other electron spins anti – clockwise in order to from 2 opposite magnetic fields to decrease the force of repulsion between them which keep the atom stable.
·         It has only two possible values + 1/2 – 1/2





Give reason: Each orbital carries 2 electrons although they are negatively charged.

Summary of the relationship between the principle E.L, sub levels orbitals and no of electrons:

1-   No of energy sublevels = order of principle level (n).
2-   No of orbitals within a principle level = square the no of the level (n2).
3-   No of electrons occupying a given E. level = two times the square order of this
                                                                   level (2n2).

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