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Physical Chemistry

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23 Jun 2012 21:59:23 IST

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atomic structure

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aufbau principle

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Himanshu

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24 Jun 2012 04:43:58 IST

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Please post your query properly. For Aufbau principle , refer to wikipedia.~cheers

Sagar Saxena

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26 Jun 2012 17:06:50 IST

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hello.......

Stable atoms have as many electrons as they do protons in the nucleus. The electrons gather around the nucleus in quantum orbitals following four basic rules called the aufbau principle

no two electrons in the atom will share the same four quantum numbers n,l,m and s .
electrons will first occupy orbitals of the lowest energy level.
electrons will fill an orbital with the same spin number until the orbital is filled before it will begin to fill of the opposite spin number.
electrons will fill orbitals by the sum of the quantum numbers n and l . Orbitals with equal values of(n+l) will fill with the lower n values first.

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