Of the thousands of different isotopes known to exist, a. most ...

[silviawilliams41]

Of the thousands of different isotopes known to exist,
 a. most of them are radioactive
  b. only a couple can be used to build an atom bomb
  c. some are used in medical diagnosis and treatment
  d. most occur naturally
  e. all of the above

Question 2

Cold fusion has
 a. solved the world's energy crisis
  b. been used to create superheavy elements
  c. been achieved using muons
  d. rendered nuclear reactors obsolete

[marict]

Answer to Question 1

A, B, C

Answer to Question 2

B, C

[silviawilliams41]

TYSM

[mcabuhat]

Excellent