The free, fun, and effective way to learn chemistry!
Learn by Building
Build atoms from protons, neutrons and electrons, fill shells and orbitals, and work on a live periodic table. Every Check names the exact mistake.
Build every atom from protons, neutrons and electrons, and read what the numbers on its symbol mean.
Build Your Chemistry Streak
Stay consistent and watch your progress grow! Track your daily chemistry habit, protect your streak with freeze days, and earn rewards for showing up every day.
12 days streak
Return tomorrow to keep your streak!
January 2026
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Double or Nothing
Day 5 of 7
Streak Freeze
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You're Not Alone
Compete on global leaderboards, invite friends to earn rewards, and celebrate each other's wins. Chemistry is better with friends!
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Promotion zoneEvery way to learn
Read, listen, test yourself, ask the AI about your own bench, or look up anything you've already covered. Every lesson meets you where you are.
Everything around you is matter, and all matter is made of tiny particles called atoms.
A substance made of only one kind of atom is an element. There are 118 known elements.
The periodic table lists every element with its symbol: H for hydrogen, O for oxygen.
Earn a Certificate
Earn a certificate when you complete a section. Add it to your LinkedIn profile to show how far your chemistry has come.
Certificate of Completion
Chemistry Atomic Structure
Add to LinkedInFrequently asked questions
Can I teach myself chemistry?
Yes. Chemistry at the start is a small set of ideas that everything else is built on: what an atom is made of, how its electrons are arranged and how the periodic table is organized. What self-study usually lacks is feedback when you get one of those wrong. Here every challenge is checked as you do it, and the check names the mistake.
What is the best way to learn chemistry?
Start with the atom and do things with it rather than memorizing facts about it. Build atoms and ions, write configurations, place elements on the table. Once you can explain why sodium forms Na⁺ and chlorine forms Cl⁻, bonding and reactions follow from it.
Is chemistry hard to learn?
It feels hard when it is learned as a list of facts. Most of it follows from a few rules: protons decide the element, electrons fill shells in a fixed order, and the periodic table is arranged by both. Learn the rules on real examples and the facts stop needing to be memorized.
Do I need math to learn chemistry?
Less than people expect. The atomic structure section needs only arithmetic, and the stoichiometry section adds a few simple formulas such as n = m/M and PV = nRT. Every calculation is solved in steps on a board that checks each step and its unit.
Are Coddy's chemistry lessons free?
Yes. Every chemistry lesson runs in your browser, free, with nothing to install. Pro removes the daily limit and adds unlimited help from Bugsy, the AI tutor.
