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What is the mass number for an atom of xenon containing 54 protons and 79 neutrons?
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2. Atoms & Elements
The Atom
Multiple Choice
How many protons are present in a neutral atom of phosphorus (P)?
A
14
B
31
C
16
D
15
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검증된 단계별 안내1
Identify the element in question, which is phosphorus (P).
Recall that the number of protons in a neutral atom is equal to the atomic number of the element.
Look up the atomic number of phosphorus on the periodic table; this number represents the number of protons.
Understand that the atomic number of phosphorus is 15, meaning it has 15 protons.
Confirm that since the atom is neutral, the number of protons equals the number of electrons, but the question only asks for protons.
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