Question

(a) Name and state the principle, which restricts the maximum number of electrons in an orbital to be two. 

(b) Using s, p, d, f notation represent the sub-shell with the following quantum numbers. 

(i) n = 1, l = 0 

(ii) n = 4, l = 3 

(c) The uncertainty in the position and velocity of a particle are 10 cm and 5.27 × 10³ m/s respectively. Calculate the mass of the particle (h=6.626 × 10^-34 J s).

Answer 1

(a) Pauli’s exclusion principle

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

(b) (i) 1s 

(ii) 4f 

(c) According to Heisenberg’s uncertainty principle,