Multiple Choice
What does the number next to an isotope (for example, carbon-14) signify?
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2. Atoms & Elements
Isotopes
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Mercury has several isotopes. How many neutrons are present in the most abundant isotope of mercury, Hg-202?
A
100
B
80
C
202
D
122
Verified step by step guidance1
Identify the atomic number of mercury (Hg), which is the number of protons. Mercury's atomic number is 80.
Recognize that the isotope notation Hg-202 means the isotope has a mass number (A) of 202. The mass number is the sum of protons and neutrons in the nucleus.
Use the formula to find the number of neutrons (N): \(N = A - Z\), where \(A\) is the mass number and \(Z\) is the atomic number.
Substitute the known values into the formula: \(N = 202 - 80\).
Calculate the difference to find the number of neutrons in Hg-202.
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