Multiple Choice
Where is most of the atom's mass located?
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- 1. Intro to General Chemistry3h 48m
- Classification of Matter18m
- Physical & Chemical Changes19m
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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
- Electron Configurations of Transition Metals7m
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- Ligands10m
- Complex Ions5m
- Coordination Complexes7m
- Classification of Ligands11m
- Coordination Numbers & Geometry9m
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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 the nucleus of an argon (Ar) atom?
A
40
B
22
C
8
D
18
Verified step by step guidance1
Recall that the number of protons in the nucleus of an atom is equal to the atomic number of the element.
Identify the element given in the problem, which is argon (Ar).
Look up the atomic number of argon on the periodic table; this number represents the number of protons.
Note that the atomic number of argon is 18, meaning it has 18 protons in its nucleus.
Understand that the other numbers given (40, 22, 8) could represent mass number or other quantities, but the proton count is determined solely by the atomic number.
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