Composition of Seawater (Elements) 🌊

Name the ten most abundant elements found in seawater, on average.

At 3.5% salinity

Percent by mass

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Last updated: October 20, 2023

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First submitted	October 28, 2021
Times taken	168
Average score	70.0%
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%	Element
85.84	oxygen
10.82	hydrogen
1.94	chlorine
1.08	sodium
0.1292	magnesium

%	Element
0.091	sulfur
0.04	calcium
0.04	potassium
0.0067	bromine
0.0028	carbon

Level 85

Oct 28, 2021

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