| Front | Describe an atom |
| Back | Mostly empty space, with a small, dense, positively charged nucleus consisting of protons and neutrons. Electrons orbit the nucleus in shells. |
| Extra | [Also in physical chemistry cards] |
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| Front | Draw a diode & light-emitting diode |
| Back |
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| Extra | |
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| Front | How are quarks held together? |
| Back | By strong nuclear force |
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