Chem 25/26 ACP Review Atoms/Electron Config/Isotopes/EMS

Multiple Choice

In 1897, J.J. Thomson used a device like the one shown to discover that cathode rays were streams of —

• photons

• electrons

• protons

• neutrons

Multiple Choice

J. J. Thomson's Atomic Model

Multiple Choice

Bohr Model of an atom

Multiple Choice

Modern Model (Quantum Mechanical Model) of an Atom

Multiple Choice

This could be the dot diagram of

• P
• Ar
• Na
• B

Multiple Choice

The electron configuration of an atom is 1s²2s²2p⁶.  The number of electrons in the atom is 

• 3
• 6
• 8
• 10

Multiple Choice

What atom matches this electron configuration?
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰

• Zinc
• Copper
• Nickel
• Germanium

Multiple Choice

Which electron configuration belongs to Chlorine (Cl)?

• 1s² 2s² 2p⁶ 3s² 3p⁵
• 1s² 2s² 2p⁶ 3s² 3p⁶
• 1s² 2s² 2p⁶ 3s² 3p⁷

Multiple Choice

Which electron configuration belongs to Carbon (C)?

• 1s² 2s² 2p³

• 1s² 2s² 2p²

• 1s² 2s⁴

Hund's Rule

Analogy: think of it like seats on a bus. Strangers will spread out before sitting next to someone else.

Multiple Choice

What is an isotope? 

• A charged atom

• An atom with different amounts of neutrons

• An atom with different amounts of protons

• A neutral atom

Multiple Choice

What is the mass number (atomic mass) of the pictured isotope?

• 2

• 4

• 6

• Hehehehe

Multiple Choice

how do you find the number of neutrons in an isotope?

• atomic number + electrons

• mass number - atomic number

• atomic number + bosons

Multiple Choice

Magnesium exists as the three isotopes shown. What is the average atomic mass of magnesium?

• 20.74 amu

• 22.56 amu

• 18.39 amu

• 24.31

Multiple Choice

The table shows the two isotopes of an unknown element. What is the average atomic mass of the unknown element?

• 5.40 amu

• 10.5 amu

• 10.8 amu

• 11.0 amu

Multiple Choice

Use the electromagnetic spectrum to answer the next question.

According to the particle theory of light, radiation from which part of the electromagnetic spectrum is made

of photons with the highest energy?

• X-rays

• Visible light

• Radio waves

• Gamma rays

Multiple Choice

The diagram shows the colors and wavelengths of the visible part of the electromagnetic spectrum.

Which set of colors is listed from highest to lowest frequency?

• Violet, Red, Indigo

• Blue, Green, Orange

• Red, Blue, Violet

• Orange, Violet, Green

Multiple Choice

Select the correct order of waves on the electromagnetic spectrum from the longest wavelength to the shortest wavelength

• Radio, Micro, Infra, Visible, Ultra, X-ray, Gamma

• Gamma, X-ray, Ultra, Vis, Infra, Micro, Radio

• Vis, Micro, Infra, Ultra, X-ray, Gamma, Radio

• Micro, Radio, Vis, Infra, Ultra, X-ray, Gamma

Multiple Choice

Which has the LONGEST wavelength and, therefore, the lowest frequency/energy

• Gamma Rays
• Radio Waves
• Visible Light
• Infrared rays

Multiple Choice

High frequency waves have _________ wavelengths.

• varying
• long
• the same
• short