Q: A photon of light has a wavelength of $500\ \mathrm{nm}$. What is its energy in joules? (Use $h = 6.626 \times 10^{-34}\ \mathrm{J\cdot s}$ and $c = 3.00 \times 10^8\ \mathrm{m/s}$)

$3.98 \times 10^{-19}\ \mathrm{J}$

Question 1

Which of the following statements best describes the difference between emission and absorption spectra in atomic transitions?

Accepted Answer

Emission and absorption involve the same energy jumps, but in opposite directions: emission is from higher to lower energy, absorption is from lower to higher energy.

Question 2

A photon of light has a wavelength of $500\ \mathrm{nm}$. What is its energy in joules? (Use $h = 6.626 	imes 10^{-34}\ \mathrm{J\cdot s}$ and $c = 3.00 	imes 10^8\ \mathrm{m/s}$)

Accepted Answer

$3.98 	imes 10^{-19}\ \mathrm{J}$

Question 3

Which set of quantum numbers is NOT allowed for an electron in an atom?

Accepted Answer

$n=2,\ l=2,\ m_l=+1,\ m_s=+\frac{1}{2}$

Question 4

How many orbitals are present in the $d$ subshell?

Accepted Answer

5

Question 5

Which electron configuration represents the element with atomic number 8 (oxygen)?

Accepted Answer

$1s^2\ 2s^2\ 2p^4$

Question 6

Which quantum number determines the shape of an orbital?

Accepted Answer

Angular momentum quantum number $l$

Question 7

If an electron transitions from $n=4$ to $n=2$ in a hydrogen atom, what happens?

Accepted Answer

The atom emits energy and a photon is emitted.

Question 8

Which of the following best explains why the $p$ subshell has three orbitals?

Accepted Answer

Because $l=1$ and $m_l$ can be $-1, 0, +1$

Question 9

Which of the following transitions in the hydrogen atom would produce the highest energy photon?

Accepted Answer

$n=2 \rightarrow n=1$

Question 10

What is the maximum number of electrons that can occupy the $3p$ subshell?

Accepted Answer

6

Question 11

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

Accepted Answer

Magnetic quantum number $m_l$

Question 12

A sodium atom emits a photon with a wavelength of $589\ \mathrm{nm}$ during a flame test. What color is this photon most likely to appear?

Accepted Answer

Yellow

Question 13

Which of the following is the correct order of filling for the first 18 elements according to the Aufbau principle?

Accepted Answer

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

Question 14

Which of the following elements has a completely filled $2p$ subshell?

Accepted Answer

Neon ($Z=10$)

Question 15

How many total orbitals are present in the $n=3$ shell?

Accepted Answer

9

Question 16

Which quantum number can have values of $-2, -1, 0, +1, +2$?

Accepted Answer

Magnetic quantum number $m_l$ for $l=2$

Question 17

Which of the following best describes the $f$ orbitals?

Accepted Answer

They have $l=3$ and there are 7 possible $m_l$ values.

Question 18

Which electron configuration is correct for the element phosphorus ($Z=15$)?

Accepted Answer

$1s^2\ 2s^2\ 2p^6\ 3s^2\ 3p^3$

Question 19

Which of the following is a possible value for the spin quantum number $m_s$?

Accepted Answer

$+\frac{1}{2}$

Light, Energy, and Atomic Orbitals: Quantum Concepts in General Chemistry

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