Chemistry
Grade-9
Easy
Question
Which noble gas has 18 protons?
- Xenon
- Neon
- Krypton
- Argon
Hint:
Atomic number of Argon is 18.
The correct answer is: Argon
- Number of proton in an element is equal to the atomic number.
- Atomic number of Xenon is 54, Neon is 10, Krypton is 36.
- Atomic number of Argon is 18. Hence, proton number of Argon is 18.
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