For an orbital the graph between psi((r ...

For an orbital the graph between `psi_((r ))` and `r` (distance from nucles) is :

Find the value of `n+l` of the orbital.

`1`

`2`

`3`

None of these

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The correct Answer is:

For an orbital the …………..
It is `1s` orbital.

In an orbital electrons are filled according to Aufbau principle, Pauli's exclusion principle and Hund's rule of maximum muliplicity . According to Aufbau principal the orbital are filled in order to their increasing energies . In the order of increase of energy of orbitals cna be calculated from ( n + l ) rule. Lower the value of ( n + l ) for an orbital the lowest energy hence orbital are filled in order of increasing ( n + l ) value. If two orbitals have same ( n + l ) value, the orbital with lower value of 'n' has lower energy hence it is filled first. According to Pauli's exclusion principle, an orbital can have maximum two electrons with opposite spin. According to Hunds rule pairing of electron in degenerate orbitals of the same sub shell does not take place until each orbital belonging to that sub shell has got one electron each i.e., singly occupied. If n=4, how many element are possible?

`r_(1):r_(2)`

`r_(1)^(2):r_(2)^(2)`

`r_(2):r_(1)`

`r_(2)^(2):r_(1)^(2)`

1.40 km/s

1.87 km/s

4.44 km/s

3.33 km/s