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Ch.2 Atoms and the Periodic TableWorksheetSee all chapters
All Chapters
Ch.1 Matter and Measurements
Ch.2 Atoms and the Periodic Table
Ch.3 Ionic Compounds
Ch.4 Molecular Compounds
Ch.5 Classification & Balancing of Chemical Reactions
Ch.6 Chemical Reactions & Quantities
Ch.7 Energy, Rate and Equilibrium
Ch.8 Gases, Liquids and Solids
Ch.9 Solutions
Ch.10 Acids and Bases
Ch.11 Nuclear Chemistry
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Sections
The Atom (Simplified)
Subatomic Particles (Simplified)
Isotopes
Ions (Simplified)
Atomic Mass (Simplified)
Atomic Mass (Conceptual)
Periodic Table: Element Symbols
Periodic Table: Classifications
Periodic Table: Group Names
Periodic Table: Representative Elements & Transition Metals
Periodic Table: Elemental Forms (Simplified)
Periodic Table: Phases (Simplified)
Law of Definite Proportions
Atomic Theory
Rutherford Gold Foil Experiment
Wavelength and Frequency (Simplified)
Electromagnetic Spectrum (Simplified)
Bohr Model (Simplified)
Emission Spectrum (Simplified)
Electronic Structure
Electronic Structure: Shells
Electronic Structure: Subshells
Electronic Structure: Orbitals
Electronic Structure: Electron Spin
Electronic Structure: Number of Electrons
The Electron Configuration (Simplified)
Electron Arrangements
The Electron Configuration: Condensed
The Electron Configuration: Exceptions (Simplified)
Ions and the Octet Rule
Ions and the Octet Rule (Simplified)
Valence Electrons of Elements (Simplified)
Lewis Dot Symbols (Simplified)
Periodic Trend: Metallic Character
Periodic Trend: Atomic Radius (Simplified)
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Next SectionPeriodic Table: Phases (Simplified)

The elements on the Periodic Table exist in different forms in nature.

Concept #1: Some elements exist as monoatomic, diatomic or polyatomic elements in the natural world.

Monoatomic elements are stable alone. Diatomic elements are stable as pairs. Polyatomic elements are stable in numbers greater than two.

Diatomic Elements:

Example #1: Which of the following choices represents a monoatomic element that is also a chalcogen?

Practice: Which of the following is a polyatomic element?

Practice: Which of the following is a representative element that is not diatomic in the 4th period that is a metalloid?

Previous SectionPeriodic Table: Representative Elements & Transition Metals
Next SectionPeriodic Table: Phases (Simplified)