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Preview questions
1. What is the atomic number of Hydrogen?
1 · 2 · 3 · 4
2. Which of the following is the most abundant element in the universe?
Oxygen · Hydrogen · Carbon · Nitrogen
3. What is the molecular formula of Hydrogen gas?
H · H2 · O2 · H2O
4. Hydrogen is classified as which type of element?
Metal · Non-metal · Metalloid · Noble gas
5. At what temperature does Hydrogen liquefy?
-253 °C · -273 °C · 0 °C · 100 °C
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