Week 3 Vocabulary

What is an isotope?

• An atom with the same number of neutrons but different numbers of protons

• An atom with the same number of protons but different numbers of neutrons

• An atom with the same number of electrons but different numbers of protons

• An atom with the same number of protons and neutrons

What is the average atomic mass?

• The sum of the masses of all isotopes of an element

• The mass of the most abundant isotope of an element

• The weighted average of the masses of all isotopes of an element

• The mass of the heaviest isotope of an element

What is the nucleus of an atom?

• The outer shell of an atom containing electrons

• The center of an atom which contains protons and neutrons

• The part of an atom that contains only neutrons

• The part of an atom that contains only protons

What is nuclear fission?

• The process of combining two light nuclei to form a heavier nucleus

• The process of splitting a heavy nucleus into two or more stable nuclei with smaller mass numbers

• The emission of a helium nucleus from a radioactive nucleus

• The emission of an electron from a radioactive nucleus

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What is nuclear fusion?

• The process of splitting a heavy nucleus into smaller nuclei

• The process of combining two light nuclei to form a heavier, more stable nucleus

• The emission of a high-energy photon from a radioactive nucleus

• The emission of a helium nucleus from a radioactive nucleus

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What occurs during alpha decay?

• A neutron is changed into a proton

• A helium nucleus (2 protons and 2 neutrons) is emitted

• An electron is emitted from the nucleus

• A high-energy photon is emitted

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What occurs during beta decay?

• A helium nucleus is emitted

• A neutron is changed into a proton and an electron is emitted

• A high-energy photon is emitted

• A proton is changed into a neutron

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What occurs during gamma decay?

• A helium nucleus is emitted

• A neutron is changed into a proton

• A high-energy photon (ray of energy) is emitted

• An electron is emitted from the nucleus

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What is the half-life of a radioactive substance?

• The time required for all of the original sample to decay

• The time required for half of the original sample of radioactive nuclides to decay

• The time required for a quarter of the original sample to decay

• The time required for the original sample to double in mass

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What is radioactivity?

• The process of combining two light nuclei to form a heavier nucleus

• The spontaneous decomposition of a nucleus to form another nucleus

• The emission of a helium nucleus from a radioactive nucleus

• The emission of an electron from a radioactive nucleus

Tags

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