Bearwood Games
Electron Shells
Draw the electrons in each shell, then press Check.
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Elements
1 to 10 (hydrogen to neon)
11 to 20 (sodium to calcium)
1 to 20
Fill in the nucleus too (protons and neutrons)
Check
Show me the answer
Next element
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Protons
Neutrons
Add a shell
Take away a shell
Start again