Atomic mass of the elements, hydrogen to krypton

Name: Atomic mass of the elements, hydrogen to krypton
Creator: Unlabeled
License: Public domain (U.S. government database); the atomic weights are IUPAC's published standard values

Mass climbs faster than atomic number because bigger nuclei need extra neutrons: krypton has 36 protons but a mass of 83.8 u.

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y ↑: Atomic mass (u)
x →: Atomic number (protons)

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The data: 36 points

Atomic number (protons)	Atomic mass (u)
1	1.008
2	4.0026
3	7
4	9.012183
5	10.81
6	12.011
7	14.007
8	15.999
9	18.99840316
10	20.18
11	22.9897693
12	24.305
13	26.981538
14	28.085
15	30.973762
16	32.07
17	35.45
18	39.9
19	39.0983
20	40.08
21	44.95591
22	47.867
23	50.9415
24	51.996
25	54.93804
26	55.84
27	58.93319
28	58.693
29	63.55
30	65.4
31	69.723
32	72.63
33	74.92159
34	78.97
35	79.9
36	83.8

Source: PubChem Periodic Table (National Library of Medicine, NIH); standard atomic weights of IUPAC
Licence: Public domain (U.S. government database); the atomic weights are IUPAC's published standard values
Read: 2026-10-09
Drawn: 36 points as the puzzle showed them · line

Ran in puzzle #17 on October 13, 2026. Play it

Atomic mass of the elements, hydrogen to krypton

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