Understanding Atoms

What are the three main types of particles that make up all atoms?

• Protons, neutrons, and electrons

• Protons, neutrons, and ions

• Electrons, ions, and molecules

• Neutrons, ions, and atoms

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NGSS.MS-PS1-1

What happens when an atom gains an electron?

• It becomes positively charged

• It becomes negatively charged

• It remains neutral

• It becomes an isotope

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Fill in the blank: Outside of the nucleus, an atom is mostly _______ space.

• Empty

• Filled

• Charged

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Particles with the same electric charge ____ each other.

• A) Attract

• B) Repel

• C) Neutralize

• D) Ignore

Which particles are found in the nucleus?

• Electrons and protons

• Protons and neutrons

• Neutrons and electrons

What makes up virtually all of the mass of an atom?

• Electrons

• Protons and neutrons

• Photons

• Quarks

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NGSS.MS-PS1-1

What are isotopes of an element named for?

• Total number of protons

• Total number of neutrons

• Total number of protons and neutrons

• Total number of electrons

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In atomic structure, electrons are found ______.

• Inside the nucleus

• Orbiting the nucleus

• In the outer shell only

• In the core.

Electrons at higher energy levels are ______ from the nucleus.

• Closer

• Farther

• The same distance

• Inside

What is the role of valence electrons in chemical reactions?

• They are not involved

• They are involved

• They prevent reactions

• They slow down reactions.

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