The half-life of radium is A) the time after which an ...

[imanialler]

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.

[moormoney]

Answer to Question 1

B

Answer to Question 2

B