Multiple Choice
How many protons are present in an atom of zinc?
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2. Atoms & Elements
The Atom
Multiple Choice
How many neutrons are present in a neutral atom of phosphorus-31?
A
31
B
16
C
15
D
14
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Verified step by step guidance1
Identify the atomic number (Z) of phosphorus, which is the number of protons in the atom. For phosphorus, Z = 15.
Recognize that the mass number (A) given is 31, which represents the total number of protons and neutrons in the nucleus.
Recall 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: \(N = 31 - 15\), which gives the number of neutrons in the phosphorus-31 atom.
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