Bromine has an atomic number of 35. How many neutrons are present in the most abundant isotope of bromine?

• A. 44
• B. 35
• C. 45
• D. 80

Answer: (C)

Verified step by step guidance

1. Identify the atomic number of bromine, which is given as 35. The atomic number represents the number of protons in the nucleus of an atom.
2. Understand that the most abundant isotope of bromine has a mass number of 80. The mass number is the total number of protons and neutrons in the nucleus.
3. Recall the relationship between mass number (A), atomic number (Z), and number of neutrons (N): \(A = Z + N\).
4. Rearrange the formula to solve for the number of neutrons: \(N = A - Z\).
5. Substitute the known values into the equation: \(N = 80 - 35\), which will give the number of neutrons in the most abundant isotope of bromine.