What are the elements at the end of periods $1$ to $7$ called? Which are these elements?
The elements at the end of periods $1$ to $7$ are called noble gases (Group $18$ elements).
| Period | Element |
|---|---|
| $1$ | $He$ |
| $2$ | $Ne$ |
| $3$ | $Ar$ |
| $4$ | $Kr$ |
| $5$ | $Xe$ |
| $6$ | $Rn$ |
| $7$ | $Og$ |
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