Multiple Choice
Which of the following is the correct symbol for the isotope of potassium with 22 neutrons?
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2. Atoms & Elements
Isotopes
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Which of the following statements is correct about the isotope of plutonium with 94 protons and a mass number of 241?
A
It has 241 neutrons.
B
It has 147 neutrons.
C
It has 335 neutrons.
D
It has 94 neutrons.
Verified step by step guidance1
Identify the number of protons in the plutonium isotope, which is given as 94. This number is also the atomic number (Z) of plutonium.
Recall that the mass number (A) of an isotope is the sum of protons and neutrons in the nucleus.
Use the formula to find the number of neutrons (N): \(N = A - Z\).
Substitute the given values into the formula: \(N = 241 - 94\).
Calculate the difference to find the number of neutrons in the isotope.
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