$$6.63 \times 10$$^{-34}$$ \ \text{J} \cdot \text{s}$$

$$7.5 \times 10$$^{14}$$ \ \text{Hz}$$

Question 1

Which of the following statements best describes the quantum mechanical model of the atom?

Accepted Answer

Electrons exist in specific energy levels but their exact position and momentum cannot be simultaneously known.

Question 2

According to the Heisenberg uncertainty principle, which of the following is true?

Accepted Answer

The more precisely the position of an electron is known, the less precisely its momentum is known.

Question 3

Which equation correctly relates the energy of a photon to its frequency?

Accepted Answer

$$E = h 
u$$

Question 4

What is the value of Planck’s constant ($$h) as $$given in the study materials?

Accepted Answer

$$6.63 	imes 10$$^{-34}$$ \ 	ext{J} \cdot 	ext{s}$$

Question 5

Which of the following best explains why electrons do not crash into the nucleus according to quantum theory?

Accepted Answer

Electrons occupy quantized energy levels and cannot exist between these levels.

Question 6

Which principle states that no two electrons in the same atom can have the same set of quantum numbers?

Accepted Answer

Pauli exclusion principle

Question 7

What is the maximum number of electrons that can occupy a single orbital?

Accepted Answer

2

Question 8

Which quantum number determines the shape of an orbital?

Accepted Answer

Angular momentum quantum number ($$l)$$

Question 9

Which of the following electron configurations is correct for carbon (atomic number 6)?

Accepted Answer

$$1s^2$$ \ $$2s^2$$ \ $$2p^2$$

Question 10

Which rule explains why electrons fill degenerate orbitals singly before pairing up?

Accepted Answer

Hund’s rule

Question 11

If a photon has a wavelength of $$4.0 	imes 10$$^{-7}$$ m, what is its frequency? (Speed of light c = 3.0$$ 	imes $$10^8 m/s)$$

Accepted Answer

$$7.5 	imes 10$$^{14}$$ \ 	ext{Hz}$$

Question 12

Which of the following statements about the periodic table and electron configurations is correct?

Accepted Answer

The periodic table is arranged so that elements with similar valence electron configurations are in the same group.

Question 13

Which of the following best describes the relationship between wavelength ($$\lambda) $$and frequency ($$
u) $$for electromagnetic waves?

Accepted Answer

$$c = \lambda 
u$$

Question 14

Which of the following is a consequence of quantization in the quantum atom?

Accepted Answer

Electrons can only occupy specific, discrete energy levels.

Question 15

Which of the following is the correct electron configuration for neon (atomic number 10)?

Accepted Answer

$$1s^2$$ \ $$2s^2$$ \ $$2p^6$$

Question 16

Which statement best describes the dual nature of electrons?

Accepted Answer

Electrons exhibit both wave-like and particle-like properties.

Question 17

Which of the following is a correct statement about orbitals?

Accepted Answer

Orbitals are regions in space where there is a high probability of finding an electron.

Question 18

Which of the following best explains why the periodic table is structured in its current form?

Accepted Answer

It reflects the filling order of electron energy levels and sublevels.

Question 19

How many electrons can be held in the $$3p$$ sublevel?

Accepted Answer

6

Question 20

Which of the following is the correct order for filling electron sublevels according to the Aufbau principle?

Accepted Answer

$$1s \rightarrow 2s \rightarrow 2p \rightarrow 3s \rightarrow 3p \rightarrow 4s \rightarrow 3d$$

5.2 and 5.3 Quantum Theory, Atomic Structure, and Electron Configurations

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