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## Quantum Mechanical Model of Atom MCQs

**1. ****Write the values for l, n, and m for ?**_{3,1,0}**?**

_{3,1,0}

a) 1, 3, 0

b) 3, 1, 0

c) 0, 3, 1

d) 1, 0, 3

**Answer: **1, 3, 0

**2. How many electrons can exist with the principal quantum number’s value as 4?**

a) 16

b) 4

c) 32

d) 12

**Answer: **32

**3. No two electrons have the same set of all four quantum numbers.**

a) True

b) False

**Answer: **True

**4. According to the Aufbau’s principle, which of the following orbital should be filled first?**

a) 5d

b) 4p

c) 3p

d) 2s

**Answer: **2s

**5. Which of the following set of quantum numbers is not valid?**

a) n = 5, l = 2, m = 0, s = 1/2

b) n = 1, l = 2, m = 0, s = 1/2

c) n = 5, l = 3, m = 2, s = 1/2

d) n = 5, l = 2, m = 0, s = -1/2

**Answer: **n = 1, l = 2, m = 0, s = 1/2

**6. Total number of nodes for 3d orbital is ________**

a) 3

b) 2

c) 1

d) 0

**Answer: **2

**7. What is the magnetic quantum number of the orbital 2pz?**

a) 1

b) ±1

c) -1

d) 0

**Answer: **0

**8. What is the shape the orbital, whose “l” is 1?**

a) Spherical

b) Dumbbell

c) Double dumbbell

d) Complex

**Answer: **Dumbbell

**9. The principal quantum number describes ____**

a) energy and size of the orbit

b) the shape of the orbital

c) spatial orientation of the orbital

d) the spin of the electron

**Answer: **energy and size of the orbit