SL Nuclear

What is likely to happen to unstable nuclei with too many, or too few, neutrons?

• They will decay by emitting radiation.

• They will loose all their electrons.

• They will bond with other atoms.

Which type of radioactive decay involves the emission of a helium nucleus?

• Alpha decay

• Beta decay

• Gamma decay

• Neutron emission

The half-life of a radioactive isotope is 10 years. If you start with 80 grams, how much will remain after 30 years?

• 10 grams

• 20 grams

• 5 grams

• 40 grams

Which of the following equations represents a nuclear reaction?

Which of the following particles is emitted during beta decay?

• Proton

• Neutron

• Electron

• Alpha particle

If a sample of a radioactive substance has a half-life of 5 years, what fraction of the original sample remains after 15 years?

X is a radioactive nuclide that decays to a stable nuclide. The activity of X falls to 1/16th of its original value in 32 s.What is the half-life of X?

• A. 2 s

• B. 4 s

• C. 8 s

• D. 16 s

Which property of a nuclide does not change as a result of beta decay?

• A. Nucleon number

• B. Neutron number

• C. Proton number

• D. Charge

Which of the following atomic energy level transitions corresponds to photons of the shortest wavelength?

• A

• B

• C

• D

A radioactive nuclide with atomic number Z undergoes a process of beta-plus (β+) decay. What is the atomic number for the nuclide produced and what is another particle emitted during the decay?

• A

• B

• C

• D