Assignment – 1
Structure of Atom
Que 1. Neutrons can be found in all atomic nuclei except in one case. Which is this atomic nucleus and what does it consists of?

Que 2. Calculate wave number of yellow radiations having wavelength of 5800 A0.

Que 3. What are the values of n and l for 2p orbital?

Que 4. Which of the following orbitals are not possible? 1p, 2s, 3f and 4d

Que 5. Write the electronic configuration of the element having atomic number 24.

Que 6. What is the relationship between frequency and wavelength of light?

Que 7. State Pauli Exclusion Principle.

Que 8. When α- rays hit a thin foil of gold, very few α- particles is deflected back. What does it prove?

Que 9. What is the difference between a quantum and a photon?

Que 10. Using s,p,d and f notation, describe the orbital with the following quantum numbers-
                  (a)   n  = 1, l = 0     (b) n = 3, l = 1            (c) n = 4, l = 2             (d) n = 4, l = 3     
 
Que 11. How many electrons in an atom have the following quantum numbers?
                  a.     n  = 4, m = -1/2          b. n = 3 , l = 0

Que 12. An element with mass number 81 contains 31.7 % more neutrons as compared to protons. Assign the atomic symbol.

Que 13. (i) The energy associated with the first orbit in the hydrogen atom is -2.18 × 10-18J/atom. What is the energy associated with the fifth orbit.
(ii) Calculate the radius of Bohr’s fifth orbit for hydrogen atom.     

Que 14. Calculate the total number of angular nodes and radial nodes present in 3p orbitals.