Question

6.) Afbau principle -
States that​

Answer 1

Explanation:

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Answer 2

Explanation:

Aufbau Principle:

The Aufbau principle states that in the ground state of an atom, the orbital with a lower energy is filled up first before the filling for the orbital with a higher energy commences. In other words, the electrons enter the various orbitals in the order of increasing energy. The energy of the orbital is given by (n+l) rule. The orbital which has higher (n+l) value has

higher energy. If the value (n+l) for two orbital is same, then the orbital having higher value of n has higher

energy. For eg. (n+l) for 4p = 3d = 5.4p and 3d both have same value of (n+l) but 4p has higher energy as it has higher value of n.

The increasing order of energy of various orbitals is:

1s,2s 2p, 3s, 3p,4s, 3d, 4p,5s, 4d, 5p, 6s, 4f,50,6p,75,5f,6d...

This order of orbitals is only a guidance and exceptions are known in few cases of atoms.