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SCH3U Full Interactive Course

Ontario Grade 11 Chemistry (SCH3U) • interactive lessons with visuals, formulas, and quick checks

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Explore Atomic Structure

Change the number of protons, neutrons, and electrons to build intuition for atomic number, mass number, and charge.

Current lesson
1.1 Atomic Structure
Main skill
Interpret particles
Visual focus
Particle diagram
Practice type
Quick multiple choice
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Concept

Short explanation in student-friendly language.

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Interactive

Change variables and see the result instantly.

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Quick Check

Practice one review question right away.

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Study Smart

Think in particles first, then use the formulas and ratios.

Explore the interactive model

1.1 Atomic Structure

Atomic number equals the number of protons. Mass number equals protons plus neutrons. Charge depends on the balance between protons and electrons.

Big idea
Chemistry starts with particles and their interactions.
Study move
Separate what determines identity, mass, and charge.
Atomic number = protons
What to notice
Changing electrons affects charge but not the element identity.
Current output
Atomic number: 1
Quick check & teacher tips

Quick check

Which particle determines the atomic number?

Formula / rule
Atomic number = protons ; mass number = protons + neutrons
How to remember it
Protons give identity, neutrons add mass, and electrons control charge.
Exam hints
  • Write the particle counts clearly.
  • Check whether the particle diagram is neutral or ionic.
  • Keep track of units in mole and concentration questions.
After-class practice

After-class practice

Question 1 of 10Score 0 / 0

Work through all ten at your own pace. Pick an answer to see a worked solution, then use Previous / Next to move around. Reset clears your answers.

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Short-answer practice

Short-answer practice

Write, then reveal the answer key

Open-response questions — work them out on paper or in the box, then reveal the answer key to compare. Nothing here is auto-marked.

SCH3U interactive study companion • Move the sliders, predict what will happen before it does, then test yourself with the quick check and the after-class practice set.