Timestamps:
0:00 - Introduction
0:14 - Period 1 (H - He)
0:30 - Period 2 (Li - Ne)
1:33 - Period 3 (Na - Ar)
2:39 - Period 4 (K - Kr)
5:01 - Period 5 (Rb - Xe)
7:26 - Period 6 (Cs - Rn)
11:41 - Period 7 (Fr - Og)
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