Multiple Choice
Which of the following is the correct nuclear symbol for the isotope of silicon with a mass number of 29?
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Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many neutrons are present in an isotope of selenium-83?
A
29
B
34
C
56
D
49
Verified step by step guidance1
Identify the atomic number (Z) of selenium, which is the number of protons in the nucleus. Selenium has an atomic number of 34.
Recognize that the isotope notation selenium-83 means the mass number (A) is 83. The mass number is the total number of protons and neutrons in the nucleus.
Use the relationship between mass number, protons, and neutrons: \(A = Z + N\), where \(N\) is the number of neutrons.
Rearrange the formula to solve for neutrons: \(N = A - Z\).
Substitute the known values: \(N = 83 - 34\), which gives the number of neutrons in selenium-83.
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