North Carolina
7. Atomic Theory
7.2 Subatomic Particles, Protons, neutrons, electrons
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8th Grade Science
Matter
7. Atomic Theory
7.2 Subatomic Particles, Protons, neutrons, electrons
Subatomic Particles: Protons, Neutrons, and Electrons
Discover the three building blocks of every atom protons, neutrons, and electrons and learn how their charges, masses, and locations determine the identity and behavior of all matter.
What You'll Learn
Protons, neutrons, and electrons are the three main subatomic particles.
Atomic number equals proton count and identifies each unique element.
Ions form when atoms gain or lose electrons, changing overall charge.
Valence electrons in outer shells determine how atoms chemically bond.
What You'll Practice
1
Students identify subatomic particle charges, masses, and nucleus locations.
2
Learners calculate atomic number, mass number, and neutron count values.
3
Practice questions distinguish neutral atoms, ions, and isotopes by properties.
Why This Matters
Understanding subatomic particles is the essential foundation for all of chemistry and physics, explaining how every element, compound, and chemical reaction in the universe works.
This Unit Includes
Practice exercises
Learning resources
Skills
Atomic Structure
Subatomic Particles
Atomic Number
Ions
Isotopes
NC Curriculum Aligned