ธาตุคาบ 8

ธาตุคาบ  8 (period 8 element) คือทั้งหมดที่อยู่ในแถวที่ 8 ของตารางธาตุ ธาตุในคาบดังกล่าวยังไม่มีการสังเคราะห์หรือค้นพบขึ้น  โดยธาตุคาบ 8 นี้เป็นการพยากรณ์โดย IUPAC (International Union of Pure and Applied Chemistry)
โลหะแอลคาไล
โลหะแอลคาไลน์เอิร์ท
แลนทาไนด์
แอกทิไนด์
โลหะทรานซิชัน
โลหะหลังทรานซิชัน
ธาตุกึ่งโลหะ
อโลหะ
แฮโลเจน
แก๊สมีสกุล
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ตารางธาตุ