Structure of Atom

Structure of Atom
Class:XI / Unit:2

1. The orientation of atomic orbitals depends on their

spin quantum number
magnetic quantum number
azimuthal quantum number
principal quantum number

2. A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emissions is at 680 nm, the other is at:

325 mn
743 nm
518 nm
1027 nm

3. Which of the following statements in relation to the hydrogen atom is correct?

3s, 3p and 3d orbitals all have the same energy
3s orbital is lower in energy than 3p orbital
3p orbital is lower in energy than 3d orbital
3s and 3p orbitals are of lower energy than 3d orbital

4. The magnetic quantum number specifies

Nuclear Stability
Shape of orbitals
Orientation of orbitals
Size of orbitals

5. Which of the following element has least number of electrons in its M-shell?

Sc
Ni
K
Mn

6. The electrons of the same orbitals can be distinguished by

Principal quantum number
Azimuthal quantum number
Magnetic quantum number
Spin quantum number

7. In the Bohrs model of the hydrogen atom, the ratio of the kinetic energy to the total energy of the electron in a quantum state n is:

-1
1
-2
2

8. Which of the following statements does not form a part of Bohrs model of hydrogen atom?

Electrons revolve in different orbits around the nucleus
The electron in the orbit nearest the nucleus has the lowest energy
The position and velocity of the electrons in the orbit cannot be determined simultaneously
Energy of the electrons in the orbit is quantised

9. A sub-shell with n = 6 , l = 2 can accommodate a maximum of

36 electrons
10 electrons
12 electrons
72 electrons

10. In Hydrogen atom, energy of first excited state is – 3.4 eV. Then find out KE of same orbit of Hydrogen atom

6.8 eV
+13.6 eV
-13.6 eV
3.4 eV