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Which subatomic particle determines the identity of an element?
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- 1. Intro to General Chemistry4h 5m
- Classification of Matter18m
- Physical & Chemical Changes19m
- Chemical Properties7m
- Physical Properties6m
- Intensive vs. Extensive Properties15m
- Temperature13m
- Scientific Notation13m
- SI Units8m
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- Dimensional Analysis24m
- Density12m
- Density of Geometric Objects19m
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- 2. Atoms & Elements4h 40m
- The Atom10m
- Subatomic Particles17m
- Isotopes17m
- Ions27m
- Atomic Mass32m
- Periodic Table: Classifications15m
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- Polyatomic Ions25m
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- Intro to Hydrocarbons16m
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- Chirality12m
- Functional Groups in Chemistry11m
- Naming Alkanes4m
- The Alkyl Groups9m
- Naming Alkanes with Substituents13m
- Naming Cyclic Alkanes6m
- Naming Other Substituents8m
- Naming Alcohols11m
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- Naming Ethers5m
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- Naming Benzene7m
- Alkane Reactions7m
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- Amide Formation4m
- Benzene Reactions10m
- 23. Chemistry of the Nonmetals2h 39m
- Main Group Elements: Bonding Types4m
- Main Group Elements: Boiling & Melting Points7m
- Main Group Elements: Density11m
- Main Group Elements: Periodic Trends7m
- The Electron Configuration Review16m
- Periodic Table Charges Review20m
- Hydrogen Isotopes4m
- Hydrogen Compounds11m
- Production of Hydrogen8m
- Group 1A and 2A Reactions7m
- Boron Family Reactions7m
- Boron Family: Borane7m
- Borane Reactions7m
- Nitrogen Family Reactions12m
- Oxides, Peroxides, and Superoxides12m
- Oxide Reactions4m
- Peroxide and Superoxide Reactions6m
- Noble Gas Compounds3m
- 24. Transition Metals and Coordination Compounds3h 19m
- Atomic Radius & Density of Transition Metals11m
- Electron Configurations of Transition Metals7m
- Electron Configurations of Transition Metals: Exceptions11m
- Paramagnetism and Diamagnetism10m
- Ligands10m
- Complex Ions5m
- Coordination Complexes7m
- Classification of Ligands11m
- Coordination Numbers & Geometry9m
- Naming Coordination Compounds22m
- Writing Formulas of Coordination Compounds8m
- Isomerism in Coordination Complexes17m
- Orientations of D Orbitals4m
- Intro to Crystal Field Theory10m
- Crystal Field Theory: Octahedral Complexes5m
- Crystal Field Theory: Tetrahedral Complexes4m
- 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
Scelta multipla
Which of the following is the number of protons in an atom of sodium (Na)?
A
10
B
23
C
12
D
11
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Guida verificata passo dopo passo1
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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