An atom of silver-107 (Ag-107) has an atomic number of 47. How many neutrons does it contain?

• A. 47
• B. 107
• C. 54
• D. 60

Answer: (D)

Verified step by step guidance

1. Identify the atomic number (Z) of silver, which is given as 47. The atomic number represents the number of protons in the nucleus of the atom.
2. Recognize that the mass number (A) of silver-107 is 107. 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 the number of neutrons: \(N = A - Z\).
5. Substitute the known values into the equation: \(N = 107 - 47\) to find the number of neutrons in the silver-107 atom.