Exploring Atomic Structure and Isotopes

What is the charge of a proton?

• Negative

• Positive

• Neutral

• Variable

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How many times smaller are electrons compared to protons or neutrons?

• 2000 times

• 500 times

• 100 times

• 5000 times

What does the atomic number in the periodic table represent?

• Number of neutrons

• Number of isotopes

• Number of electrons

• Number of protons

If an atom has four protons, what element is it?

• Beryllium

• Lithium

• Boron

• Carbon

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What defines isotopes of an element?

• Same number of electrons, different protons

• Same number of protons, different neutrons

• Same number of neutrons, different electrons

• Same number of neutrons, different protons

What is the process called when unstable isotopes decay into other elements?

• Electromagnetic radiation

• Radioactive decay

• Ionization

• Nuclear fusion

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What happens when an electron gains enough energy?

• It becomes a proton

• It leaves the atom

• It moves to a lower energy level

• It becomes excited and moves to a higher energy level

What is emitted when an excited electron falls back to a lower energy level?

• Protons

• Neutrons

• Electromagnetic radiation

• Alpha particles

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NGSS.HS-PS4-3

What is the result when an atom loses an electron?

• It becomes an isotope

• It becomes a negative ion

• It becomes neutral

• It becomes a positive ion

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NGSS.HS-PS1-2

What does ionizing radiation do to atoms?

• Knocks off neutrons

• Adds protons

• Knocks off electrons

• Adds neutrons

Tags

NGSS.HS-PS1-8