Multiple Choice
Which subatomic particle determines the identity of an element?
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- 1. Intro to General Chemistry3h 48m
- Classification of Matter18m
- Physical & Chemical Changes19m
- Chemical Properties7m
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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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- Noble Gas Compounds3m
- 24. Transition Metals and Coordination Compounds3h 16m
- 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 Complexes14m
- Orientations of D Orbitals4m
- Intro to Crystal Field Theory10m
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- Crystal Field Theory: Square Planar Complexes4m
- 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
Which of the following is the number of protons in an atom of sodium (Na)?
A
10
B
23
C
12
D
11
Verified step by step guidance1
Recall that the number of protons in an atom is given by its atomic number, which is unique for each element.
Identify the element in question, which is sodium (Na).
Look up the atomic number of sodium on the periodic table; this number represents the number of protons in a sodium atom.
Note that the atomic number of sodium is 11, meaning it has 11 protons.
Understand that the other numbers given (10, 23, 12) represent either the number of neutrons, the atomic mass, or are incorrect values for the number of protons.
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