The half-life of radium is
A) the time after which an individual radium atom splits in half.
B) the time during which half of a large number of radium atoms will decay.
C) half the lifetime of the individual radium atom.
D) the life-time of the individual radium atom.
E) half of the total time during which a quantity of radium will radioactively decay.
Question 2
Historically, the earliest atomic model to explain electrical phenomena was
A) the quantum model.
B) the planetary model.
C) the Hollywood model.
D) the Greek model.
E) Galileo's model.
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