What are quantum numbers? Explain briefly the various quantum numbers which completely specify an electron in an atom. 

An electron is placed in 4f orbital. What possible values for the quantum numbers, n, l, m and s can it have?

(i) An atomic orbital has n = 3. what are the possible values of l and m_l ?

(ii) List the quantum number (m_l and l) of electrons for 3d orbital.

(iii) Which of the following orbitals are possible: 1p, 2s, 2p, and 3f?

How many electrons in an atom may have the following quantum numbers?
(a) n = 4, m_s = - ¹/₂              (b) n = 3,  l = 0

An atomic orbital has n = 3, What are the possible value of l?

209.

Give all the possible values of l, m and s for electrons when n = 3.

Using s, p, d notations describe 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.