Summary table of mean ocean concentrations and residence times.  See the page of each element for references.

The concentration generally decreases with increasing atomic number.

meanconcvsnumber

The residence time is generally longer for elements with higher concentrations.restimevsmeanconc

Atomic #ElementMean OceanAtomic MassMean OceanMean OceanUNITResidence Time
  Conc. Conc.Conc     yrs
  ng/kgg/molnmol/kgRational Units
1H+  1.20E+0112nmol/kg
2He7.60E+004.00261.90E+001.9nmol/kg
3Li1.80E+056.94102.59E+0425.9µmol/kg2,800,000
4Be2.10E-019.01222.33E-0223pmol/kg1,000
5B4.50E+0610.81104.16E+05416µmol/kg9,600,000
6C2.70E+0712.01102.25E+062.248mmol/kg83,000
7N28.30E+0614.00675.93E+05590µmol/kg
7NO34.20E+0514.00673.00E+0430µmol/kg3,000
8O22.80E+0615.99941.75E+05175µmol/kg
9F1.30E+0618.99846.84E+0468µmol/kg500,000
10Ne1.60E+0220.17977.93E+007.9nmol/kg
11Na1.08E+1022.98984.69E+08469mmol/kg55,000,000
12Mg1.28E+0924.30505.27E+0752.7mmol/kg13,000,000
13Al3.00E+0126.98151.11E+001.11nmol/kg200
14Si2.80E+0628.08559.97E+0499.7µmol/kg20,000
15PO46.20E+0430.97382.00E+032µmol/kg69,000
16SO4–8.98E+0832.06602.80E+0728mmol/kg8,700,000
17Cl-1.94E+1035.45275.46E+08546mmol/kg87,000,000
18Ar6.20E+0539.94801.55E+0415.5µmol/kg
19K3.99E+0839.09831.02E+0710.2mmol/kg12,000,000
20Ca4.12E+0840.07801.03E+0710.27mmol/kg1,100,000
21Sc7.00E-0144.95591.56E-0216pmol/kg
22Ti6.50E+0047.88001.36E-01136pmol/kg150
23V2.00E+0350.94153.93E+0139nmol/kg50,000
24Cr(VI)2.10E+0251.99604.04E+004nmol/kg8,000
25Mn2.00E+0154.93803.64E-01360pmol/kg60
26Fe3.00E+0155.84705.37E-01540pmol/kg500
27Co1.20E+0058.93322.04E-0220pmol/kg340
28Ni4.80E+0258.69348.18E+008.2nmol/kg6,000
29Cu1.50E+0263.54602.36E+002.4nmol/kg5,000
30Zn3.50E+0265.39005.35E+005.4nmol/kg50,000
31Ga1.20E+0069.72301.72E-0217pmol/kg500
32Ge5.50E+0072.61007.57E-0275pmol/kg20,000
33As1.20E+0374.92162.00E+0120nmol/kg39,000
34Se1.55E+0278.96001.96E+001.9nmol/kg26,000
35Br6.70E+0779.90408.39E+05840µmol/kg130,000,000
36Kr3.10E+0283.80003.70E+003.7nmol/kg
37Rb1.20E+0585.46781.40E+031.4µmol/kg3,000,000
38Sr7.80E+0687.62008.90E+0489µmol/kg5,100,000
39Y1.70E+0188.90591.91E-01190pmol/kg5,100
40Zr1.50E+0191.22401.64E-01160pmol/kg5,600
41Nb5.00E+0092.90645.38E-023.8pmol/kg
42Mo1.00E+0495.94001.04E+02100nmol/kg760,000
43Tc      
44Ru5.00E-03101.07004.95E-05<49fmol/kg
45Rh8.00E-02102.90557.77E-04780fmol/kg
46Pd6.00E-02106.42005.64E-04560fmol/kg10,000
47Ag2.00E+00107.86801.85E-0218pmol/kg
48Cd7.00E+01112.41006.23E-01620pmol/kg50,000
49In1.00E-02114.82008.71E-0587fmol/kg100
50Sn5.00E-01118.71004.21E-034.2pmol/kg4
51Sb2.00E+02121.75701.64E+001.6nmol/kg5,700
52Te7.00E-02127.60005.49E-04550fmol/kg100
53I5.80E+04126.90454.57E+02460nmol/kg340,000
54Xe6.60E+01131.29005.03E-01500pmol/kg
55Cs3.06E+02132.90542.30E+002.3nmol/kg330,000
56Ba1.50E+04137.33001.09E+02109nmol/kg10,000
57La5.60E+00138.90554.03E-0240pmol/kg1,000
58Ce7.00E-01140.12005.00E-035pmol/kg100
59Pr7.00E-01140.90774.97E-035pmol/kg500
60Nd3.30E+00144.24002.29E-0223pmol/kg600
61Pm      
62Sm5.70E-01150.36003.79E-033.8pmol/kg700
63Eu1.70E-01151.96501.12E-031.1pmol/kg600
64Gd9.00E-01157.25005.72E-035.7pmol/kg800
65Tb1.70E-01158.92531.07E-031.1pmol/kg800
66Dy1.10E+00162.50006.77E-036.8pmol/kg1,000
67Ho3.60E-01164.93032.18E-032.2pmol/kg2,700
68Er1.20E+00167.26007.17E-037.2pmol/kg2,700
69Tm2.00E-01168.93421.18E-031.2pmol/kg5,000
70Yb1.20E+00173.04006.93E-036.9pmol/kg2,200
71Lu2.30E-01174.96701.31E-031.3pmol/kg6,200
72Hf3.40E+00178.49001.90E-020.71pmol/kg1,300
73Ta2.50E+00180.94791.38E-020.2pmol/kg
74W1.00E+01183.85005.44E-0254pmol/kg61,000
75Re7.80E+00186.20704.19E-0241pmol/kg
76Os2.00E-03190.20001.05E-0556fmol/kg40,000
77Ir1.30E-04192.22006.76E-07680amol/kg2,000
78Pt5.00E-02195.08002.56E-04250fmol/kg
79Au9.85E-03196.96655.00E-0550fmol/kg380
80Hg1.40E-01200.59006.98E-04700fmol/kg350
81Tl1.30E+01204.38306.36E-0264pmol/kg
82Pb2.70E+00207.20001.30E-0213pmol/kg80
83Bi3.00E-02208.98041.44E-04140fmol/kg
84Po  3.00E-1130zmol/kg100
85At      
86Rn  3.00E-123zmol/kg0.01
87Fr      
88Ra1.30E-04226.02545.75E-07580amol/kg
89Ac  2.00E-1120zmol/kg
90Th2.00E-02232.03818.62E-0590fmol/kg45
91Pa 231.03591.80E-0818amol/kg200
92U3.20E+03238.02901.34E+0113.4nmol/kg400,000