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- What is the atomic number of oxygen
- 2
- 6
- 8
- 12
- 15
- 3
- What is the first element in the periodic table
- Oxygen
- Nitrogen
- Iron
- Hydrogen
- Lithium
- 4
- Which element is not a halogen
- Iron
- Chlorine
- Bromine
- Iodine
- Fluorine
- 1
- What is group 0 called
- Halogens
- Noble Gases
- Alkali metals
- Alkali earth metals
- Acid metals
- 2
- What is the electron configuration of lithium
- 2.2
- 2
- 2.8
- 2.5
- 2.1
- 5
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