Quantum Number

Q.

The radius of second Bohr orbit, in terms of the Bohr radius, ${𝑎}_0$ , in ${\mathrm{Li}}^{2+}$ is:

1. $\frac{2{\mathrm{a}}_0}{3}$

2. $\frac{4{\mathrm{a}}_0}{9}$

3. $\frac{4{\mathrm{a}}_0}{3}$

4. $\frac{2{\mathrm{a}}_0}{9}$

Q.

The difference between n^th and (n+1)^th Bohrs radius of the hydrogen atom is equal to (n−1)^th Bohrs radius. Find the value of n.

Q.

How many radial nodes does a 5s orbital have ?

Q.

The orbital angular momentum of an electron in a 3d-subshell is:

1. Zero

2. $\frac{\mathrm{h}}{2\mathrm{\pi }}$

3. $\frac{\mathrm{h}}{4\mathrm{\pi }}$

4. $\frac{\sqrt{6}\mathrm{h}}{2\mathrm{\pi }}$

Q.

Does the orbital Velocity depend on the Mass?

Q.

Explain magnetic quantum number?

Q.

What are the features of quantum mechanical model?

Q.

As the quantum number increases, the difference of energy between conservative energy levels____.

1. Increases

2. Decreases

3. Remains the same

4. Increases and then decreases.

Q.

Which of the following set of quantum numbers (n, l, m, s) represents the valence electron in a copper atom? (atomic number of Cu = 29)

1. $\mathrm{n}=4,\mathrm{l}=1,\mathrm{m}=0,\mathrm{s}=+\frac{1}{2}$

2. $\mathrm{n}=4,\mathrm{l}=1,\mathrm{m}=+2,\mathrm{s}=+\frac{1}{2}$

3. $\mathrm{n}=4,\mathrm{l}=0,\mathrm{m}=0,\mathrm{s}=+\frac{1}{2}$

4. $\mathrm{n}=4,\mathrm{l}=0,\mathrm{m}=+2,\mathrm{s}=+\frac{1}{2}$

Q.

The shape of a 3p orbital resembles_________.

Q.

Which one of the following orbitals can hold only two electrons?

1. $3s$

2. $2p$

3. $4d$

4. $5f$

Q.

Any two electrons in an atom can have a maximum of three quantum numbers same.

1. True
2. False

Q.

In how many $\mathrm{d}$- orbitals do the lobes lie in between co-ordinate axes? what are those?

Q.

The shape of the $p_x$ orbital is_________.

Q.

How many radial nodes are present in 5f orbital?

Q.

The azimuthal quantum number indicates the angular momentum of an electron.

1. True
2. False

Q. Which of the following properties of orbitals are described by magnetic quantum number?

1. Spin
2. Orientation
3. Size
4. Shape

Q. The maximum number of electrons that can be accommodated in f-shell is:

1. 2
2. 8
3. 18
4. 14

Q. The maximum number of electrons that can have principal quantum number, $n=3$ and spin quantum number, $m_s=-\frac{1}{2}$ are:

Q. What is principal quantum number and in that L is depend upon what

Q. Azimuthal quantum number value for a dumb-bell shaped orbital is :

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

Q. The maximum number of electron that can be accommodated in all the orbitals for which $l=3$ is:

1. $2$
2. $6$
3. $14$
4. $10$

Q. ________ quantum number describes the size and energy of the shell.

1. Magnetic
2. Spin
3. Angular momentum
4. Principal

Q. Any p orbital can accommodate up to :

1. four electrons
2. two electrons with parallel spin
3. six electrons
4. two electrons with opposite spin

Q.

Predict the possible atomic number(s) of an atom in which the third shell is incompletely filled and a maximum of 3 more electrons can be added in that shell.

Q. The electrons occupying the same orbital have the same values for all the quantum number except for:

1. $n$
2. $l$
3. $m$
4. $s$

Q. The maximum number of electrons in $n=1,l=0,m=0,s=$$\pm$$1/2$ is :

Q. For any two electron in an atom, the set of all four quantum number can be same

1. True
2. False

Q. What are quantum numbers

Q.

Calculate the radius of the third orbit of a single electron species, if the energy of this orbit is $-13.6\mathrm{eV}.$

1. $1.58\mathrm{\AA }$

2. $0.529\mathrm{\AA }$

3. $1058\mathrm{\AA }$

4. $2096\mathrm{\AA }$