PRACTICE TEST! Chapter 4

Multiple Choice – Choose the Best Answer. Which of the following is the correct isotope symbol for an atom of magnesium-25?

Multiple Choice – Choose the Best Answer. Two isotopes of chlorine have mass numbers 35 and 37. What is true about their atomic structure?

• They have different numbers of protons.

• They have different numbers of neutrons.

• They have different numbers of electrons.

• They have different atomic numbers.

Multiple Choice – Choose the Best Answer. What is the main difference between a stable isotope and a radioactive isotope?

• Stable isotopes are less heavy than radioactive isotopes.

• Radioactive isotopes are only produced in labs, while stable isotopes are found in nature.

• Radioactive isotopes have a nucleus that is unstable and will decay over time.

• Stable isotopes have more protons than neutrons.

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NGSS.HS-PS1-8

Multiple Choice – Choose the Best Answer. A radioactive isotope emits a beta particle. What happens in the atom’s nucleus?

• The mass number decreases by 4.

• A neutron changes into a proton.

• A proton changes into a neutron.

• The number of protons decreases by 2.

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NGSS.HS-PS1-8

Multiple Choice – Choose the Best Answer. What type of nuclear reaction combines two small nuclei into one larger nucleus?

• Fission

• Fusion

• Alpha decay

• Gamma emission

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NGSS.HS-ESS1-1

NGSS.HS-PS1-8

Multiple Choice – Choose the Best Answer. In which type of nuclear reaction does a large heavy nucleus absorb a neutron and split into smaller nuclei and some neutrons?

• Fission

• Fusion

• Alpha decay

• Gamma emission

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NGSS.HS-PS1-8

Multiple Choice – Choose the Best Answer. Which of the following isotopes is most likely to be unstable?

• Oxygen-16

• Iron-56

• Uranium-238

• Carbon-12

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Multiple Choice – Choose the Best Answer. If carbon-14 undergoes beta decay, which new element forms?

• Boron-14

• Nitrogen-14

• Oxygen-14

• Carbon-13

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Multiple Choice – Choose the Best Answer. In an alpha decay reaction, what particles are emitted from the nucleus?

• One proton and one neutron

• Two protons and two neutrons

• Two protons and four neutrons

• Two electrons and two positrons

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NGSS.HS-PS1-8

Multiple Choice – Choose the Best Answer. What is the parent isotope if the products are a daughter isotope of Krypton-90 and an alpha particle?

• Strontium-94

• strontium-92

• Selenium-86

• selenium-88

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NGSS.HS-PS1-8