Which of the following is not a naturally occurring nuclear fuel ?

A. Uranium
B. Plutonium
C. Radium
D. None of these

A. Deuterium
B. Ortho-hydrogen
C. Tritium
D. None of these

A. Mass number
B. Electronic configuration
C. Nuclear charge
D. Chemical properties

A. β-rays
B. X-rays
C. γ-rays
D. Ultra violet rays

A. 1100
B. 2200
C. 3300
D. 4400

A. 141
B. 92
C. 233
D. 325