Chemistry Basics
MS-PS1-1
Relate atomic number, mass, and subatomic particles
Use atomic number, mass number, protons, neutrons, and electrons.
Learn the skill
- 1Use atomic number, mass number, protons, neutrons, and electrons.
- 2Distinguish atoms, elements, molecules, compounds, and mixtures.
Cited instruction
Use the publisher's material for instruction, then return to PeerTutor for the checked practice written for this skill.
Atoms · Khan AcademyPractice preview
Element model 17 is being identified. Which particle count determines its atomic number?
Atomic number 18, mass number 23. How many neutrons?
Element model 7 is being identified. Which particle count determines its atomic number?
Course mapping reviewed by Nikhil on 2026-08-26. Practice is authored for PeerTutor and does not reproduce linked providers' exercises.