Hund's Rule

Q.

Hund's Rule states that:

1. No two electrons in an atom can have the same set of four quantum numbers

2. The maximum number of electrons in the shell with principal quantum n is equal to 2n²

3. Pairing of electrons in the orbitals belonging to the same subshell (p, d or f) does not take place until each orbital belonging to that subshell has got one electron each i.e., it is singly occupied

4. None of these

Q. The presence of one electron each in the three 2p orbitals of nitrogen is explained by

1. Paulis principle
2. Bohrs theory
3. Hunds rule
4. Uncertainty principle

Q.

Nitrogen has the electronic configuration $1s^2,2s^{2}2p_x^{1}2p_y^{1}2p_z^1$ and not $1s^2,2s^{2}2p_x^{2}2p_y^{1}2p_z^0$ which is determined by

1. Aufbau's principle

2. Pauli's exclusion principle

3. Hund's rule

4. Uncertainty principle

Q. A compound of vanadium has a magnetic moment μ of 1.73 BM. If the vanadium ion in the compound is present as $V^{x+}$, then the value of x is?

1. 1
2. 2
3. 3
4. 4

Q. Which one is a wrong statement?

1. The electronic configuration of N atom is:
   
2. An orbital is designated by three quantum numbers while an electron in an atom is designated by four quantum numbers
3. Total orbital angular momentum of electron in 's' orbital is equal to zero
4. The value of m for $d_z^2$ is zero

Q. The preference of three unpaired electrons in the ground state of phosphorous can be explained by:

1. Pauli's exclusion principle
2. Aufbau principle
3. Heisenberg's uncertainty principle
4. Hund's rule

Q. The number of unpaired electrons in the ground state of $Cl$ atom $(atomicnumber=17)$ is:

1. 1
2. 2
3. 0
4. 3

Q. The principles that gives the correct explanation why ground state electronic configuration of $Si$ is
and not
is:

1. Heisenberg's uncertainty principle
2. Hund's rule
3. Pauli's exclusion principle
4. Aufbau Principle

Q. Which of the following represents the correct outer configuration of Nitrogen?

1. 
2. 
3. 
4. All of the above

Q. In the following electronic arrangement, which of the following is violated?


I: Hund's rule
II: Pauli's exclusion principle
III: Aufbau principle

1. I and II
2. II and III
3. I, II and III
4. I and III