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Option 4 : Argon
- Please note we have asked for a Noble gas and not the overall composition.
- With about 0.935%, Argon is the most abundantly found noble gas and the third most abundant gas found in the Earth's atmosphere.
- Comprising 0.00015% of the Earth's crust, Argon is also the most abundantly found noble gas in the Earth's crust.
- Argon has an atomic number of 18 and comes under group 18 of the periodic table.
- Nobel gases are odourless and colourless gases that have very low reactivity on account of their completely full valence shells.
| Noble Gas | Atomic Number |
| Helium | 2 |
| Neon | 10 |
| Xenon | 54 |
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