MCQ
The inert gas present in the second long period is:
- A$Kr$
- ✓$Xe$
- C$Ar$
- D$Rn$
✓
Answer
Correct option: B.
$Xe$
Periods $4$ and $5$ are called long periods as they contain $18$ elements each.
$4^{th}$ period is called the first long period and the inert gas in this period is $Kr.$
$5^{th}$ period is the second long period where $Xe$ is the inert gas element.
$4^{th}$ period is called the first long period and the inert gas in this period is $Kr.$
$5^{th}$ period is the second long period where $Xe$ is the inert gas element.
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