← All lists

Top 5 most abundant elements in seawater (by mass)

evergreen

The 5 most abundant elements in seawater (by mass) by mass fraction of seawater: Oxygen, Hydrogen, Chlorine, Sodium, Magnesium.

Snapshot · 2026-09-23

Today's five picks, one great list, and today's game. Free, every evening.

  1. 1

    Oxygen

    ~85.8%

  2. 2

    Hydrogen

    ~10.8%

  3. 3

    Chlorine

    ~1.9%

  4. 4

    Sodium

    ~1.1%

  5. 5

    Magnesium

    ~0.13%