Multiple Choice
What is the mass number for an atom of xenon containing 54 protons and 79 neutrons?
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- 1. Intro to General Chemistry3h 47m
- Classification of Matter18m
- Physical & Chemical Changes19m
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- 23. Chemistry of the Nonmetals2h 40m
- Main Group Elements: Bonding Types4m
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- Noble Gas Compounds3m
- 24. Transition Metals and Coordination Compounds3h 19m
- Atomic Radius & Density of Transition Metals11m
- Electron Configurations of Transition Metals7m
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- Paramagnetism and Diamagnetism10m
- Ligands10m
- Complex Ions5m
- Coordination Complexes7m
- Classification of Ligands11m
- Coordination Numbers & Geometry9m
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- Isomerism in Coordination Complexes17m
- 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
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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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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