Multiple Choice
Which of the following statements best describes the difference between the valence band and the conduction band in a solid?
Table of contents
- 1. Intro to General Chemistry3h 48m
- Classification of Matter18m
- Physical & Chemical Changes19m
- Chemical Properties7m
- Physical Properties5m
- Intensive vs. Extensive Properties13m
- Temperature12m
- Scientific Notation13m
- SI Units7m
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- 2. Atoms & Elements4h 17m
- The Atom9m
- Subatomic Particles15m
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- Ions27m
- Atomic Mass28m
- Periodic Table: Classifications11m
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- 9. Quantum Mechanics2h 59m
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- 10. Periodic Properties of the Elements3h 9m
- The Electron Configuration22m
- The Electron Configuration: Condensed4m
- The Electron Configurations: Exceptions13m
- The Electron Configuration: Ions12m
- Paramagnetism and Diamagnetism8m
- The Electron Configuration: Quantum Numbers16m
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- 14. Solutions3h 1m
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- 16. Chemical Equilibrium2h 30m
- 17. Acid and Base Equilibrium5h 2m
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- Bases Introduction7m
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- Diprotic Acids and Bases8m
- Diprotic Acids and Bases Calculations30m
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- 18. Aqueous Equilibrium4h 47m
- Intro to Buffers20m
- Henderson-Hasselbalch Equation19m
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- Strong Titrate-Strong Titrant Curves9m
- Weak Titrate-Strong Titrant Curves15m
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- 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
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- 19. Chemical Thermodynamics1h 50m
- 20. Electrochemistry2h 42m
- 21. Nuclear Chemistry2h 37m
- Intro to Radioactivity10m
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- Band of Stability: Electron Capture & Positron Emission4m
- Band of Stability: Overview14m
- Measuring Radioactivity7m
- Rate of Radioactive Decay12m
- 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
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- Ester Reactions: Saponification3m
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- 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
- 1. The Chemical World10m
10. Periodic Properties of the Elements
Valence Electrons of Elements
Multiple Choice
How many valence electrons does an atom of calcium (Ca) have?
A
4
B
8
C
2
D
6
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Verified step by step guidance1
Identify the element in question, which is calcium (Ca).
Determine the atomic number of calcium, which is 20, meaning it has 20 electrons in a neutral atom.
Write the electron configuration of calcium to understand the distribution of electrons in its shells: \$1s^2 2s^2 2p^6 3s^2 3p^6 4s^2$.
Recognize that valence electrons are the electrons in the outermost shell, which for calcium is the 4th shell (4s orbital).
Count the electrons in the outermost shell (4s), which gives calcium 2 valence electrons.
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