객관식
Which of the following is the atomic number of gold (Au)?
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- 1. Intro to General Chemistry3h 46m
- Classification of Matter18m
- Physical & Chemical Changes19m
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- 10. Periodic Properties of the Elements3h 10m
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- The Alkyl Groups9m
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- 23. Chemistry of the Nonmetals2h 39m
- Main Group Elements: Bonding Types4m
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- The Electron Configuration Review16m
- Periodic Table Charges Review20m
- Hydrogen Isotopes4m
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- Production of Hydrogen8m
- Group 1A and 2A Reactions7m
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- Nitrogen Family Reactions12m
- Oxides, Peroxides, and Superoxides12m
- Oxide Reactions4m
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- 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
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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
Periodic Table: Element Symbols
Multiple Choice
Which of the following is an example of a chemical element?
A
Na
B
H2O
C
NH3
D
CO2
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검증된 단계별 안내1
Understand that a chemical element is a pure substance consisting of only one type of atom, represented by a unique chemical symbol on the periodic table.
Look at each option and identify whether it is a single element or a compound made of multiple elements bonded together.
Recognize that 'Na' is the chemical symbol for sodium, which is a single element.
Note that 'H2O' (water), 'NH3' (ammonia), and 'CO2' (carbon dioxide) are chemical compounds composed of two or more different elements chemically bonded.
Conclude that among the options, only 'Na' represents a chemical element.
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