The nucleon number and the proton number of a neutral atom of an element are 238 and 92 respectively. What is the number of neutrons in the atom?

The nucleon number and the proton number of a neutral atom of an element are 238 and 92 respectively. What is the number of neutrons in the atom?

A 330
B 165
C 146
D 119
E 73

waec 1990 physics

The correct answer is C. 146

No explanation given

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