Multiple Choice
If two atoms have the same number of protons in their nucleus, you can conclude for sure that they:
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2. Atoms & Elements
The Atom
Multiple Choice
Phosphorus-33 (atomic number 15) contains how many neutrons?
A
18 neutrons
B
33 neutrons
C
15 neutrons
D
33 protons
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Verified step by step guidance1
Identify the atomic number of Phosphorus, which is given as 15. The atomic number represents the number of protons in the nucleus of the atom.
Recognize that the isotope notation Phosphorus-33 indicates the mass number, which is the total number of protons and neutrons in the nucleus.
Use the relationship between mass number (A), atomic number (Z), and number of neutrons (N): \(A = Z + N\).
Rearrange the formula to solve for the number of neutrons: \(N = A - Z\).
Substitute the known values: \(N = 33 - 15\), which gives the number of neutrons in Phosphorus-33.
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