Multiple Choice
How many protons are present in an atom of antimony (Sb)?
Table of contents
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- 1. The Chemical World10m
2. Atoms & Elements
The Atom
Multiple Choice
How many neutrons are present in the nucleus of a sodium atom with a mass number of 23?
A
12
B
11
C
10
D
23
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Verified step by step guidance1
Identify the atomic number (Z) of sodium, which is the number of protons in the nucleus. For sodium, Z = 11.
Understand that the mass number (A) is the total number of protons and neutrons in the nucleus. Here, A = 23.
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: \(N = 23 - 11\), which gives the number of neutrons in the sodium nucleus.
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