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periodic system▼◼◼◼noun[UK: ˌpɪə.rɪ.ˈɒ.dɪk ˈsɪ.stəm] [US: ˌpɪ.ri.ˈɑː.dɪk ˈsɪ.stəm]
Periodic Table of the Elements▼◼◼◼
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