| The electron quantum numbers
according to the Aufbau method based on the hydrogen atom for the first 10
elements |
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| Element (nth electron) |
Principal Qunatum Number |
Subsidiary Qunatum Number |
Magnetic Qunatum Number |
Spin Qunatum Number |
| H (1st) |
n = 1 |
l = 0 |
ml = 0 |
ms = -1/2 * |
| He (2nd) |
n = 1 |
l = 0 |
ml = 0 |
ms = +1/2 |
| Li (3rd) |
n = 2 |
l = 0 |
ml = 0 |
ms = -1/2 * |
| Be (4th) |
n = 2 |
l = 0 |
ml = 0 |
ms = +1/2 |
| B (5th) |
n = 2 |
l = +1 |
ml = -1 |
ms = -1/2 * |
| C (6th) |
n = 2 |
l = +1 |
ml = 0 |
ms = -1/2 ** |
| N( 7th) |
n = 2 |
l = +1 |
ml = +1 |
ms = -1/2 |
| O (8th) |
n = 2 |
l = +1 |
ml = -1 |
ms = +1/2 |
| F (9th) |
n = 2 |
l = +1 |
ml = 0 |
ms = +1/2 |
| Ne (10th) |
n = 2 |
l = +1 |
ml = +1 |
ms = +1/2 |
*arbitrary
** Hund's Rule