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Ch.2 Atoms and the Periodic TableWorksheetSee all chapters

# Subatomic Particles (Simplified)

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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

The atom is composed of 3 subatomic particles: neutrons, protons, and electrons.

###### The Atom & Subatomic Particles

Concept #1: The 3 subatomic particles share key differences and similarities in their masses and charges.

In terms of size, neutrons are the largest, protons are slightly smaller, and the electrons are the smallest.

Concept #2: Mass and Relative Charge of Subatomic Particles

Example #1: Osmium, one of the densest elements on earth, has an actual mass of 190.23 grams. According to the table above, what is its value in terms of atomic mass units?

Practice: According to the table above, how many electrons are needed to have a combined mass of 1.0465 x 10-25 kg?

Practice: How many atoms are contained in 0.230 g of sodium, Na? The mass of one sodium atom is 23.99 amu.