Structure of Atom · Question 36

Which of the following statements are true? Choose the correct answer from the options given below:

1. (A) and (B) only
2. (B) and (D) only
3. (C) and (D) only
4. (A), (B) and (C) only

Answer

(1) (A) and (B) only

Solution

(A) True. The subsidiary (azimuthal) quantum number l defines the three-dimensional shape of the orbital (s, p, d …).

(B) True. The boundary surface diagram of a 2px orbital is two lobes lying along the x-axis on either side of the nucleus, as drawn.

(C) False. The + and − signs of the wave function show the phase (sign) of in the two lobes, not electric charge.

(D) False. The nodal plane of 2px is the yz plane (x = 0); in the xy plane is not zero, because the lobes lie along the x-axis in that plane.

Only (A) and (B) are true.

Answer: (1)