Aufbau Principle

Q.

The correct order of increasing energy of atomic orbitals is

1. 5p < 4f < 6s < 5d

2. 5p < 6s < 4f < 5d

3. 4f < 5p < 5d < 6s

4. 5p < 5d < 4f < 6s

Q.

Which of the following orbital has most energy in multi-electron system?

1. 3s

2. 4p

3. 4d

4. 4s

Q.

Which of the following orbital will be filled first?

1. 4p

2. 3d

3. 5s

4. 4s

Q. what is second separation energy of electron in H atom ?

Q.

Which of the following property displays progressive increase down a group in the Bohr's periodic table

1. Electronegativity

2. Electron affinity

3. Ionization potential

4. Size of the atom

Q. Valence bond theory says that only unpaired electron of valence shell can participate in Bond formation the valence shell of carbon is 2P and in the 2P two electrons are filled and 2pz are are vacant why the electrons of 2s orbital of carbon excited and go to 2P orbital while 2s orbital is not not a valence shell of carbon

Q. how to find the number of shells and electrons in that particular shell of an atom?

Q. The quantum numbers of six electrons are given below. Arrange them in order of increasing energies.

Q. Which of the following explains the sequence of filling of subshells of an atom?

1. Hund's rule
2. Pauli's exclusion principle
3. Aufbau principle
4. All of these.

Q. Arrange the orbitals in the increasing order of their energy $3p_x,2s,4d_{xy},3s,4p_z,3p_y,4s$

1. $2s<3s=3p_x=3p_y<4s=4p_z=4d_{xy}$
2. $2s<3s<3p_x=3p_y<4s=4p_z=4d_{xy}$
3. $2s<3s<3p_x=3p_y<4s<4p_z=4d_{xy}$
4. $2s<3s<3p_x=3p_y<4s<4p_z<4d_{xy}$

Q. What is the quantum number which specifies the location as well as the energy of an electron?

Q. Identify the correct statements among the following:

1. If Aufbau principle is not followed, then $Sn$ (atomic number = 50) would be placed in $d-$ block of the periodic table
2. $5^{th}$ ionization energy of $As$ $(Z=33)$ is less than that of $Ge(Z=32)$
3. Increasing order of first ionization energy of $S,Se$ and $Cl$ is $Se<S<Cl$
4. Ionic radii of $M{g}^{2+}(Z=12)$ is smaller than $F^{-}(Z=9)$

Q. Use molecular orbital theory to explain why $B{e}_2$ molecule does not exist.

Q.

The unpaired electrons in Al and Si are present in 3p orbital. Which electrons will experience more effective nuclear charge from the nucleus?

Q. The orbital diagram in which Aufbau principle is violated is:

1. 
2. 
3. 
4. 

Q. An electron in an atom jumps in such a way that its kinetic energy changes from x to x/4. The changes in its potential enegy will b?

Q. 25. What is the ratio of radii of first orbit of H , He+, Li2+

Q. The correct increasing order of energy between $8s$ and $8p$ orbital are

1. $7d,6f$
2. $5g,6f,7d$
3. $6d,7f$
4. $6h,5g,6f,7d$

Q. 39. In the formation of N2 positive from N2 the electron is removed from option1) piee orbital 2) sigma orbital

Q. 42.The maximum number of electrons present in px orbital

Q. The electrons, identified by quantum number n and l,
(i) n = 4, l = 1(ii) n = 4, l = 0(iii) n = 3, l = 2 and (iv) n = 3, l = 1
Can be placed in order of increasing energy, from lowest to highest as

1. (iv) < (ii) < (iii) < (i)

2. (ii) < (iv) < (i) < (iii)

3. (i) < (iii) < (ii) < (iv)

4. (iii) < (i) < (iv) < (ii)

Q. The orbital diagram in which the Aufbau principle is violated is:

1. 
2. 
3. 
4. 

Q. Which of the following elements is a metalloid?

1. Lithium
2. Beryllium
3. Carbon
4. Boron

Q.

Which of the following is correct with respect to energy for multi-electron system?

$I.1s<2sII.2p<3pIII.3d_{xy}=3d_{yz}IV.3d>4s$

1. I, II

2. I, II, III

3. I, II, IV

4. I, II, III and IV

Q. Maximum number of electrons present in 4d Orbital

Q. 31.According to bohar principal the angular moment of electrons in the 6th is

Q. Which of the following rules says the electrons would go first to lower energy levels and then to the higher energy levels?

1. Aufbau Principle
2. Pauli's Exclusion Principle
3. Hund's Rule
4. Heisenberg's Uncertainty Principle

Q. 76.Maximum electrons in d orbital or how many electrons can d orbital accommodate. 2 or 10 ?

Q. If the azimuthal quantum number could have the value of $n$ also then:

1. $Sc(Z=21)$ would have configuration as $1s^{2}1p^{6}2s^{2}2p^{6}2d^{3}3s^2$
2. $Fe(Z=26)$ would have two unpaired electrons
3. $F{e}^{2+}$ and $F{e}^{3+}$ would be paramagnetic and coloured
4. $C{u}^{+}$ would be coloured and paramagnetic

Q. Which of the following rules says the electrons would go first to lower energy levels and then to the higher energy levels?

1. Aufbau Principle
2. Pauli's Exclusion Principle
3. Hund's Rule
4. Heisenberg's Uncertainty Principle