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Ch.2 - Atoms & ElementsWorksheetSee all chapters

# Subatomic Particles

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Sections
The Atom
Subatomic Particles
Isotopes
Ions
Atomic Mass
Periodic Table: Classifications
Periodic Table: Group Names
Periodic Table: Representative Elements & Transition Metals
Periodic Table: Element Symbols
Periodic Table: Elemental Forms
Periodic Table: Phases
Periodic Table: Charges
Calculating Molar Mass
Mole Concept
Law of Conservation of Mass
Law of Definite Proportions
Atomic Theory
Law of Multiple Proportions
Millikan Oil Drop Experiment
Rutherford Gold Foil Experiment

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

###### The Atom & Subatomic Particles

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

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

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 required to produce a charge of –2.0 C?

Practice: If the charge and mass of one proton is 1.60218 x 10-19 C and 1.673 x 10-30 g respectively, what is the charge of 378 kg of protons?