Which statement about the radioactive decay of a substance is correct?
It cannot be predicted when a particular nucleus will decay.
Placing a radioactive substance inside a lead-lined box prevents it from decaying.
The decay always produces poisonous gases.
The rate of decay increases if the substance is dissolved in water.
A
Which row correctly describes an example of radioactive decay?
original
nucleus
emission
change or
no change of element
stable
γ
change of element
unstable
α
change of element
unstable
α
no change of element
unstable
β
no change of element
B
Which statement about alpha decay is correct?
The nucleus loses electrons.
The nucleus changes to that of a different element.
The nucleus does not decay until after one half-life.
After two half-lives, alpha decay always stops.
B