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first 20 elements
Question | Answer |
---|---|
Hydrogen | 1 |
Helium | 2 |
Lithium | 3 |
Berylium | 4 |
Boron | 5 |
Carbon | 6 |
Nitrogen | 7 |
Oxygen | 8 |
Flourine | 9 |
Neon | 10 |
Sodium | 11 |
Magnesium | 12 |
Aluminum | 13 |
Silicon | 14 |
Phosphorus | 15 |
Sulfur | 16 |
Chlorine | 17 |
Argon | 18 |
Potassium | 19 |
Calcium | 20 |