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What is the difference between the number of neutrons in an atom of iridium, Ir, with a mass number of 193, and the number of neutrons in an atom of plutonium, Pu, with a mass number of 244?

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Answer: 150-116 = 34

Explanation: no. of neutrons in Ir ⇒ 193-77= 116

no. of neutrons in Pu ⇒ 244-94 = 150

so diffrence is 34

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