Question 1

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

Accepted Answer

$E = h 
u$

Question 2

A photon has a wavelength of $4.50 	imes 10^{-7}$ m. What is its frequency? (Speed of light $c = 3.00 	imes 10^8$ m/s)

Accepted Answer

$6.67 	imes 10^{14}$ Hz

Question 3

Which quantum number determines the shape of an atomic orbital?

Accepted Answer

Azimuthal quantum number ($l$)

Question 4

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

Accepted Answer

2

Question 5

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

Accepted Answer

Pauli exclusion principle

Question 6

Calculate the energy of a photon with a wavelength of $650$ nm. ($h = 6.626 	imes 10^{-34}$ J·s, $c = 3.00 	imes 10^8$ m/s)

Accepted Answer

$3.06 	imes 10^{-19}$ J

Question 7

Which of the following best describes the difference between absorption and emission spectra?

Accepted Answer

Absorption spectra show dark lines where light is absorbed; emission spectra show bright lines where light is emitted.

Question 8

What is the value of the magnetic quantum number ($m_l$) for a $d$ orbital?

Accepted Answer

$-2, -1, 0, +1, +2$

Question 9

Which quantum number is responsible for the orientation of an orbital in space?

Accepted Answer

Magnetic quantum number ($m_l$)

Question 10

If an electron transitions from $n=3$ to $n=2$ in a hydrogen atom, what happens?

Accepted Answer

The atom emits a photon and the electron loses energy.

Question 11

Which equation gives the energy levels of the hydrogen atom?

Accepted Answer

$E_n = -\frac{R_H}{n^2}$

Question 12

What is the wavelength of an electron moving at $2.5 	imes 10^6$ m/s? ($h = 6.626 	imes 10^{-34}$ J·s, $m_e = 9.11 	imes 10^{-31}$ kg)

Accepted Answer

$2.91 	imes 10^{-10}$ m

Question 13

Which statement about the periodic table is correct?

Accepted Answer

Elements in the same group have similar chemical properties.

Question 14

Which orbital has the highest energy in a multi-electron atom?

Accepted Answer

$3p$

Question 15

What is the main factor that determines the shielding effect in an atom?

Accepted Answer

The value of the azimuthal quantum number ($l$)

Question 16

Which of the following best explains why $2p$ orbitals are less shielded than $2s$ orbitals?

Accepted Answer

Because $2s$ orbitals penetrate the nucleus more effectively than $2p$ orbitals.

Question 17

Which rule explains the order in which atomic orbitals are filled?

Accepted Answer

Aufbau principle

Question 18

What is the wavelength of a photon emitted when an electron in a hydrogen atom transitions from $n=4$ to $n=2$? ($R_H = 2.18 	imes 10^{-18}$ J, $h = 6.626 	imes 10^{-34}$ J·s, $c = 3.00 	imes 10^8$ m/s)

Accepted Answer

$4.86 	imes 10^{-7}$ m

Question 19

Which quantum number is associated with electron spin?

Accepted Answer

Spin quantum number ($m_s$)

Atomic Energy Levels and Electronic Structure: Study Notes for General Chemistry

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