Multiple Choice
What is the mass number for an atom of xenon containing 54 protons and 79 neutrons?
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Table of contents
- 1. Intro to General Chemistry3h 48m
- Classification of Matter18m
- Physical & Chemical Changes19m
- Chemical Properties7m
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- Intensive vs. Extensive Properties13m
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- 2. Atoms & Elements4h 16m
- The Atom9m
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- 23. Chemistry of the Nonmetals2h 39m
- Main Group Elements: Bonding Types4m
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- 24. Transition Metals and Coordination Compounds3h 16m
- Atomic Radius & Density of Transition Metals11m
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- Ligands10m
- Complex Ions5m
- Coordination Complexes7m
- Classification of Ligands11m
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- Orientations of D Orbitals4m
- Intro to Crystal Field Theory10m
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- Crystal Field Theory Summary8m
- Magnetic Properties of Complex Ions9m
- Strong-Field vs Weak-Field Ligands6m
- Magnetic Properties of Complex Ions: Octahedral Complexes11m
2. Atoms & Elements
The Atom
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many protons are present in a neutral atom of phosphorus (P)?
A
14
B
31
C
16
D
15
Verified step by step guidance1
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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