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Composition of Seawater (Elements)

Name the ten most abundant elements found in seawater, on average.
At 3.5% salinity
Percent by mass
Quiz by interopia
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Last updated: October 28, 2021
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First submittedOctober 28, 2021
Times taken87
Average score70.0%
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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