객관식
How many electrons are present in a neutral atom of lithium?
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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
- SI Units7m
- Metric Prefixes24m
- Significant Figures9m
- Significant Figures: Precision in Measurements8m
- Significant Figures: In Calculations15m
- Conversion Factors16m
- Dimensional Analysis17m
- Density12m
- Density of Geometric Objects19m
- Density of Non-Geometric Objects5m
- 2. Atoms & Elements4h 24m
- The Atom10m
- Subatomic Particles15m
- Isotopes17m
- Ions27m
- Atomic Mass33m
- Periodic Table: Classifications11m
- Periodic Table: Group Names8m
- Periodic Table: Representative Elements & Transition Metals7m
- Periodic Table: Element Symbols6m
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- Periodic Table: Phases9m
- Periodic Table: Charges20m
- Calculating Molar Mass10m
- Mole Concept31m
- Law of Conservation of Mass5m
- Law of Definite Proportions10m
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- Millikan Oil Drop Experiment7m
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- 3. Chemical Reactions4h 27m
- Empirical Formula18m
- Molecular Formula20m
- Combustion Analysis40m
- Combustion Apparatus16m
- Polyatomic Ions25m
- Naming Ionic Compounds12m
- Writing Ionic Compounds8m
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- Naming Acids23m
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- Balancing Chemical Equations13m
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- Percent Yield21m
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- Functional Groups in Chemistry11m
- 4. BONUS: Lab Techniques and Procedures1h 25m
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- 6. Chemical Quantities & Aqueous Reactions4h 3m
- Solutions6m
- Molarity22m
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- Dilutions15m
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- Molecular Equations17m
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- Complete Ionic Equations18m
- Calculate Oxidation Numbers15m
- Redox Reactions20m
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- 7. Gases3h 54m
- Pressure Units6m
- The Ideal Gas Law18m
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- Chemistry Gas Laws14m
- Chemistry Gas Laws: Combined Gas Law12m
- Mole Fraction of Gases6m
- Partial Pressure19m
- The Ideal Gas Law: Molar Mass13m
- The Ideal Gas Law: Density14m
- Gas Stoichiometry18m
- Standard Temperature and Pressure14m
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- Root Mean Square Speed9m
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- Kinetic Molecular Theory15m
- Van der Waals Equation9m
- 8. Thermochemistry2h 41m
- Nature of Energy6m
- Kinetic & Potential Energy7m
- First Law of Thermodynamics7m
- Internal Energy8m
- Endothermic & Exothermic Reactions7m
- Heat Capacity19m
- Constant-Pressure Calorimetry24m
- Constant-Volume Calorimetry12m
- Thermal Equilibrium8m
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- Formation Equations9m
- Enthalpy of Formation12m
- Hess's Law23m
- 9. Quantum Mechanics3h 0m
- Wavelength and Frequency5m
- Speed of Light8m
- The Energy of Light13m
- Electromagnetic Spectrum10m
- Photoelectric Effect20m
- De Broglie Wavelength9m
- Heisenberg Uncertainty Principle17m
- Bohr Model14m
- Emission Spectrum5m
- Bohr Equation13m
- Introduction to Quantum Mechanics5m
- Quantum Numbers: Principal Quantum Number5m
- Quantum Numbers: Angular Momentum Quantum Number10m
- Quantum Numbers: Magnetic Quantum Number11m
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- Quantum Numbers: Number of Electrons11m
- Quantum Numbers: Nodes6m
- 10. Periodic Properties of the Elements3h 10m
- The Electron Configuration22m
- The Electron Configuration: Condensed4m
- The Electron Configurations: Exceptions13m
- The Electron Configuration: Ions12m
- Paramagnetism and Diamagnetism8m
- The Electron Configuration: Quantum Numbers16m
- Valence Electrons of Elements12m
- Periodic Trend: Metallic Character3m
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- Periodic Trend: Ionic Radius14m
- Periodic Trend: Ionization Energy12m
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- 11. Bonding & Molecular Structure3h 33m
- Lewis Dot Symbols10m
- Chemical Bonds13m
- Dipole Moment15m
- Octet Rule10m
- Formal Charge9m
- Lewis Dot Structures: Neutral Compounds20m
- Lewis Dot Structures: Sigma & Pi Bonds14m
- Lewis Dot Structures: Ions15m
- Lewis Dot Structures: Exceptions14m
- Lewis Dot Structures: Acids15m
- Resonance Structures21m
- Average Bond Order4m
- Bond Energy15m
- Coulomb's Law6m
- Lattice Energy12m
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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
- Atomic, Ionic, and Molecular Solids11m
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- 14. Solutions3h 8m
- Solutions: Solubility and Intermolecular Forces20m
- Molality15m
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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
- Osmotic Pressure10m
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- 15. Chemical Kinetics2h 55m
- 16. Chemical Equilibrium2h 31m
- 17. Acid and Base Equilibrium5h 5m
- Acids Introduction9m
- Bases Introduction7m
- Binary Acids15m
- Oxyacids10m
- Bases14m
- Amphoteric Species5m
- Arrhenius Acids and Bases5m
- Bronsted-Lowry Acids and Bases21m
- Lewis Acids and Bases13m
- The pH Scale17m
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- pH of Strong Acids and Bases9m
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- pH of Weak Bases32m
- Diprotic Acids and Bases8m
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- Triprotic Acids and Bases10m
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- 18. Aqueous Equilibrium4h 47m
- Intro to Buffers21m
- Henderson-Hasselbalch Equation19m
- Intro to Acid-Base Titration Curves13m
- Strong Titrate-Strong Titrant Curves9m
- Weak Titrate-Strong Titrant Curves15m
- Acid-Base Indicators8m
- Titrations: Weak Acid-Strong Base38m
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- Titrations: Diprotic & Polyprotic Buffers32m
- Solubility Product Constant: Ksp17m
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- Precipitation: Ksp vs Q12m
- Selective Precipitation9m
- Complex Ions: Formation Constant18m
- 19. Chemical Thermodynamics1h 51m
- 20. Electrochemistry2h 42m
- 21. Nuclear Chemistry2h 37m
- Intro to Radioactivity10m
- Alpha Decay9m
- Beta Decay7m
- Gamma Emission7m
- Electron Capture & Positron Emission9m
- Neutron to Proton Ratio7m
- Band of Stability: Alpha Decay & Nuclear Fission10m
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- Band of Stability: Overview14m
- Measuring Radioactivity7m
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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
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- Intro to Redox Reactions8m
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- Aldehydes and Ketones Reactions6m
- Ester Reactions: Esterification4m
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- 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
The Atom
객관식
Stars are made mostly of which two elements?
A
Hydrogen and helium
B
Carbon and oxygen
C
Nitrogen and neon
D
Iron and silicon
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검증된 단계별 안내1
Understand that stars primarily consist of elements formed during the early universe and through stellar processes.
Recall that the most abundant elements in the universe, especially in stars, are hydrogen and helium due to their formation during the Big Bang.
Recognize that hydrogen is the simplest and most abundant element, serving as the primary fuel for nuclear fusion in stars.
Helium is the second most abundant element, produced both from the Big Bang and as a product of hydrogen fusion in stars.
Conclude that the two main elements making up stars are hydrogen and helium, rather than heavier elements like carbon, oxygen, nitrogen, neon, iron, or silicon.
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