객관식
Which of the following best explains why carbon-14 is the most common isotope used for radiometric dating of once-living materials?
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목차
- 1. Intro to General Chemistry3h 48m
- Classification of Matter18m
- Physical & Chemical Changes19m
- Chemical Properties7m
- Physical Properties6m
- Intensive vs. Extensive Properties13m
- Temperature12m
- Scientific Notation13m
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- Density of Geometric Objects19m
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- 2. Atoms & Elements4h 25m
- The Atom11m
- Subatomic Particles15m
- Isotopes17m
- Ions27m
- Atomic Mass33m
- Periodic Table: Classifications11m
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- 10. Periodic Properties of the Elements3h 10m
- The Electron Configuration22m
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- Formal Charge9m
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- Average Bond Order4m
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- Coulomb's Law6m
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- 12. Molecular Shapes & Valence Bond Theory2h 0m
- 13. Liquids, Solids & Intermolecular Forces2h 28m
- Molecular Polarity10m
- Intermolecular Forces22m
- Intermolecular Forces and Physical Properties11m
- Clausius-Clapeyron Equation18m
- Phase Diagrams13m
- Heating and Cooling Curves27m
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- Solutions: Solubility and Intermolecular Forces20m
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- Mole Fraction of Solutions9m
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- Types of Aqueous Solutions8m
- Intro to Henry's Law4m
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- The Colligative Properties15m
- Boiling Point Elevation16m
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- Osmosis20m
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- 15. Chemical Kinetics2h 55m
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- 17. Acid and Base Equilibrium5h 5m
- Acids Introduction9m
- Bases Introduction7m
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- Amphoteric Species5m
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- Diprotic Acids and Bases8m
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- 18. Aqueous Equilibrium4h 47m
- Intro to Buffers21m
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- Band of Stability: Alpha Decay & Nuclear Fission10m
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- Band of Stability: Electron Capture & Positron Emission4m
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- Radioactive Half-Life16m
- Mass Defect19m
- Nuclear Binding Energy14m
- 22. Organic Chemistry5h 7m
- Introduction to Organic Chemistry8m
- Structural Formula8m
- Condensed Formula10m
- Skeletal Formula6m
- Spatial Orientation of Bonds3m
- Intro to Hydrocarbons16m
- Isomers11m
- Chirality15m
- Functional Groups in Chemistry11m
- Naming Alkanes4m
- The Alkyl Groups9m
- Naming Alkanes with Substituents13m
- Naming Cyclic Alkanes6m
- Naming Other Substituents8m
- Naming Alcohols11m
- Naming Alkenes11m
- Naming Alkynes9m
- Naming Ketones5m
- Naming Aldehydes5m
- Naming Carboxylic Acids4m
- Naming Esters8m
- Naming Ethers5m
- Naming Amines5m
- Naming Benzene7m
- Alkane Reactions7m
- Intro to Addition Reactions4m
- Halogenation Reactions4m
- Hydrogenation Reactions3m
- Hydrohalogenation Reactions7m
- Alcohol Reactions: Substitution Reactions4m
- Alcohol Reactions: Dehydration Reactions9m
- Intro to Redox Reactions8m
- Alcohol Reactions: Oxidation Reactions7m
- Aldehydes and Ketones Reactions6m
- Ester Reactions: Esterification4m
- Ester Reactions: Saponification3m
- Carboxylic Acid Reactions4m
- Amine Reactions3m
- 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
Isotopes
객관식
Which of the following correctly describes the nuclear composition of uranium-235?
A
235 protons, 0 neutrons
B
92 protons, 143 neutrons
C
92 protons, 142 neutrons
D
143 protons, 92 neutrons
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검증된 단계별 안내1
Understand that the nuclear composition of an isotope is described by the number of protons and neutrons in its nucleus.
Recall that the atomic number (number of protons) for uranium (U) is 92, which is constant for all uranium isotopes.
Recognize that the mass number (A) is the sum of protons and neutrons: \(A = Z + N\), where \(Z\) is protons and \(N\) is neutrons.
Given uranium-235, the mass number \(A\) is 235, and the number of protons \(Z\) is 92, so calculate neutrons as \(N = A - Z = 235 - 92\).
Conclude that uranium-235 has 92 protons and 143 neutrons, matching the correct description of its nuclear composition.
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