The correct answer is Period 5; Group 0.
The atom has valence shell n = 5, hence it belongs to Period 5.
In the valence shell, there are 2+6 = 8 valence electrons, hence the atom has a stable octet configuration and we know that this is a noble gas, and a noble gas belongs to Group 0
Group 0 elements are also known as Group 18 elements.
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