An atom's mass number is determined by the number of A) ...

[clippers!]

An atom's mass number is determined by the number of
 
  A) neutrons in its nucleus.
  B) nucleons in its nucleus.
  C) protons in its nucleus.
  D) alpha particles in its nucleus.
  E) electron masses in its nucleus.

Question 2

In a nuclear reaction, what value is conserved in addition to electric charge, energy, and momentum?
 
  A) atomic number
  B) neutron number
  C) nucleon number
  D) all of the given answers
  E) none of the given answers

[Sammyo]

Answer to Question 1

B

Answer to Question 2

C