8.p.8.7 Atomic Structure(s)

Label the different parts of the atom:

a

b

c

d

Neutron

Electron

Proton

Nucleus

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Match each term to its correct definition.

• A subatomic particle that has a positive charge and that is found in the nucleus of an atom

• Electron

• A subatomic particle that has no charge and that is found in the nucleus of an atom

• Neutron

• The center of an atom, which contains the protons and neutrons

• Proton

• A subatomic particle that has a negative charge and that is found outside of the nucleus

• Nucleus

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Review the illustration of an atom. How many electrons are found in this atom?

• 7
• 5
• 2
• 6

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Review the illustration below of an atom. Which two subatomic particles make up the nucleus of an atom?

• proton and electron
• neutron and proton
• electron and neutron
• ion and proton

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Atoms are composed of subatomic particles including protons, neutrons, and electrons. It takes more than 1,800 electrons to equal the mass of one proton. What can you conclude about the mass of an electron based on this fact?

• An electron’s mass is extremely small compared to a proton’s mass.
• An electron has the same mass as the nucleus.
• An electron’s mass is extremely large compared to a proton’s mass.
• An electron has the same mass as a neutron.

While Elisa and Carmen were studying together for science class, Elisa created a drawing of an atom as shown below. Elisa decided to test Carmen’s knowledge of subatomic particles by asking her to fill in the missing label in her drawing. Which of the following should Carmen choose for the missing label?

• element
• neutron
• electron cloud
• isotope

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According to atomic theory, elements are made up of small units. What is the name for the smallest unit of an element that can still be classified as that element?

• a molecule
• a mixture
• an atom
• a compound

Which correctly identifies a part of the atom shown in the figure below?

• A: electron

• A: ion

• B: electron

• C: neutron

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How does the size of a proton compare to the size of a neutron?

• Protons are larger than neutrons.

• Protons are smaller than neutrons.

• Protons and neutrons are equal in size.

What are the smallest units of matter?

• atoms

• AMU

• ions

• molecules

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