Measurements & Density/ Periodic trends
Bohr Model Spectra
Quantum theory
Electron Configuration
Electromagnetic Energy
100
What is the SI base unit for mass?
Kilogram (kg)
100
When an electron moves from a higher energy level to a lower energy level does it absorb or emit a photon?
Emit
100
What is the maximum number of electrons that can occupy a single orbital?
2
100
Which principle states that electrons fill the lowest-energy orbitals first?
Aufbau Principle
100
As wavelength increases, what happens to frequency?
It decreases
200
As you move from left to right across a period, atomic radius generally:
A. Increases
B. Decreases
C. Stays the same
D. Doubles
B. Decreases
200
When an electrons absorbs energy, what happens to its energy level?
Moves to a higher energy level.
200
How many orbitals are found in the n = 4 principal energy level?
16
200
Which rule states that electrons occupy degenerate orbitals singly before pairing?
Hund's rule
200
How many nanometers are in 4.50 × 10⁻⁸ m?
45.0 nm
300
Rank these atoms from smallest to largest atomic radius:
Na, Mg, Al, Si
Si < Al < Mg < Na
300
Which transition in hydrogen produces a photon with the greatest energy?
A. n = 2 → n = 1
B. n = 3 → n = 2
C. n = 4 → n = 3
D. n = 5 → n = 4
A. n=2 --> n=1
300
Which set of quantum numbers is NOT possible?
A. n = 3, l = 2, mₗ = −1
B. n = 2, l = 1, mₗ = 0
C. n = 4, l = 3, mₗ = −3
D. n = 2, l = 2, mₗ = 0
D
300
Write the full electron configuration for phosphorus.
1s² 2s² 2p⁶ 3s² 3p³
300
A wave has a frequency of 6.00 × 10¹⁴ Hz. What is its wavelength?
5.00 × 10⁻⁷ m, or 500 nm
400
A metal has a density of 8.96g/cm3. What is the volume if the mass is 67.2 g?
7.50 cm3
400
Which of these lines shows the longest wavelength?
IR n=4 --> n=3 (shortest energy therefore its the longest wavelength)
400
What is the maximum number of electrons that can occupy the n = 3 energy level?
18
400
Which atom has the following electron configuration?[Ar] 4s² 3d⁵
Mn (manganese)
400
The wavelength of a photon is 492 nm. What is the energy of one photon?
The wavelength of a photon is 492 nm. What is the energy of one photon?
500
A liquid has a density of 0.789g/mL. What mass, in kilograms would be present in 2.50 L of the liquid?
1.97 kg
500
An electron undergoes a transition from n = 5 to n = 2. Does this produce absorption or emission, and how does its wavelength compare with a transition from n = 3 to n = 2? (talk about the energy level and wavelength)
Both are emission, but n=5 --> n=2 releases more energy and therefore has a shorter wavelength.
500
What is the de Broglie wavelength of an electron moving at 2.00 × 10⁶ m/s?
Use m=9.11×10−31 kg and h=6.626×10−34 J·s.
3.64 × 10⁻¹⁰ m
500
An ion has the electron configuration:
[Ar] 3d⁶
How many unpaired electrons does it have in its ground-state orbital diagram?
4 unpaired electrons
500
Which photon has the greatest energy?
A. 700 nm
B. 500 nm
C. 400 nm
D. 250 nm
D. 250nm