Which of the following changes occur within a nucleus when it emits an alpha particle?Its mass number increases by 4 and its atomic number increases by 2Its mass number decreases by 2 and its atomic number decreases by 2Its mass number decreases by 4 and its atomic number decreases by 2Its mass number increases by 2 and its atomic number increases by 22Which of the following changes occurs within a nucleus when it emits a beta (minus) particle?Its mass number stays the same and its atomic number decreases by 1Its atomic number stays the same and its mass number decreases by 1Its mass number stays the same and its atomic number increases by 1Its atomic number stays the same and its mass number increases by 13Which of the following things will NOT occur when a nucleus undergoes gamma decay?The nucleus will move to a lower-energy stateThe atomic number of the nucleus won’t changeA short-wavelength, high-frequency electromagnetic wave will be emitted from the nucleusThe mass number of the nucleus will decrease4Polonium-194 is formed by the alpha decay of radon-198. There are 84 protons in the nucleus of a polonium-194 atom. Calculate the number of neutrons in the nucleus of an atom of radon-198.84112110865Which type(s) of nuclear radiation will be stopped by a sheet of aluminium?Alpha particles, beta particles and gamma raysBeta particles onlyAlpha particles onlyAlpha particles and beta particles6Which of the following changes occurs within a nucleus when it emits a neutron?Its atomic number stays the same and its mass number decreases by 1Its mass number stays the same and its atomic number increases by 1Its mass number stays the same and its atomic number decreases by 1Its atomic number stays the same and its mass number increases by 1
Question
Which of the following changes occur within a nucleus when it emits an alpha particle?Its mass number increases by 4 and its atomic number increases by 2Its mass number decreases by 2 and its atomic number decreases by 2Its mass number decreases by 4 and its atomic number decreases by 2Its mass number increases by 2 and its atomic number increases by 22Which of the following changes occurs within a nucleus when it emits a beta (minus) particle?Its mass number stays the same and its atomic number decreases by 1Its atomic number stays the same and its mass number decreases by 1Its mass number stays the same and its atomic number increases by 1Its atomic number stays the same and its mass number increases by 13Which of the following things will NOT occur when a nucleus undergoes gamma decay?The nucleus will move to a lower-energy stateThe atomic number of the nucleus won’t changeA short-wavelength, high-frequency electromagnetic wave will be emitted from the nucleusThe mass number of the nucleus will decrease4Polonium-194 is formed by the alpha decay of radon-198. There are 84 protons in the nucleus of a polonium-194 atom. Calculate the number of neutrons in the nucleus of an atom of radon-198.84112110865Which type(s) of nuclear radiation will be stopped by a sheet of aluminium?Alpha particles, beta particles and gamma raysBeta particles onlyAlpha particles onlyAlpha particles and beta particles6Which of the following changes occurs within a nucleus when it emits a neutron?Its atomic number stays the same and its mass number decreases by 1Its mass number stays the same and its atomic number increases by 1Its mass number stays the same and its atomic number decreases by 1Its atomic number stays the same and its mass number increases by 1
Solution
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The correct answer is "Its mass number decreases by 4 and its atomic number decreases by 2". When a nucleus emits an alpha particle, it loses 2 protons and 2 neutrons, which results in a decrease in both mass number and atomic number.
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The correct answer is "Its mass number stays the same and its atomic number increases by 1". When a nucleus emits a beta particle, a neutron in the nucleus is converted into a proton and an electron. The electron is emitted as the beta particle. This results in an increase in the atomic number but the mass number remains the same.
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The correct answer is "The mass number of the nucleus will decrease". Gamma decay involves the emission of energy in the form of gamma rays. It does not involve the emission of particles, so the mass number and atomic number of the nucleus do not change.
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The correct answer is "108". Radon-198 has a mass number of 198 and an atomic number of 86 (since it decays into Polonium-194 which has 84 protons and alpha decay decreases atomic number by 2). The number of neutrons is found by subtracting the atomic number from the mass number, so 198 - 86 = 112 neutrons.
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The correct answer is "Alpha particles only". Alpha particles are the least penetrating type of nuclear radiation and can be stopped by a sheet of aluminium. Beta particles and gamma rays are more penetrating and require thicker or denser materials to stop them.
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The correct answer is "Its atomic number stays the same and its mass number decreases by 1". When a nucleus emits a neutron, its mass number decreases by 1 but its atomic number stays the same because the number of protons (which determine the atomic number) has not changed.
Similar Questions
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Any atom that emits an alpha particle or a beta particlea. always becomes an atom of a different element.b. may become an atom of a different element.c. becomes a different isotope of the same element.d. increases its mass.e. becomes highly reactive.
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