5
QuizMultiple Choice

Radioactivity

Question 5 • GA-GSE Physical Science A

Elemental carbon has 6 protons and 6 neutrons. This is often described as carbon-12. Carbon-13 has 6 protons and 7 neutrons, while carbon-14 has 6 protons and 8 neutrons. Based on the trend with carbon and the fact that plutonium has 94 protons, how many neutrons are in radioactive plutonium-244?

Answer
A
102 neutrons
B
108 neutrons
C
150 neutrons
D
338 neutrons

Explanation

The number after an element’s name is its mass number, which equals protons plus neutrons. Plutonium-244 has a mass number of 244 and 94 protons, so it has 244 − 94 = 150 neutrons. The correct choice is 150 neutrons.

AI-written and checked against the verified answer.

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