How many neutrons are present in the isotope germanium-75?

• A. 32
• B. 34
• C. 43
• D. 75

Answer: (C)

Verified step by step guidance

1. Identify the atomic number (Z) of germanium, which is the number of protons. For germanium, Z = 32.
2. Recognize that the isotope notation germanium-75 means the mass number (A) is 75. The mass number is the total number of protons and neutrons in the nucleus.
3. Use the relationship between mass number, protons, and neutrons: \(A = Z + N\), where \(N\) is the number of neutrons.
4. Rearrange the formula to solve for neutrons: \(N = A - Z\).
5. Substitute the known values: \(N = 75 - 32\), which gives the number of neutrons in germanium-75.