Element table sources

Element table sources

Source record for the PeriodicTable in VoxelSandbox.Chemistry (MASTERPLAN §28.1). This is the ground truth the atom-conservation invariant is measured against, so every value here is cited before it becomes product content. Consolidate this file into CHEMISTRY_SOURCES.md once that document’s in-flight C0 edits have landed.

Standard atomic weights

• Source: IUPAC, “Standard atomic weights of the elements 2021”, Pure and Applied Chemistry 94(5):573–600 (2022), and the CIAAW abridged table derived from it.
• URL: https://ciaaw.org/atomic-weights.htm
• The stored value is the IUPAC conventional single value for each element (the abridged five-significant-figure form where an interval is published). It is used only for molar mass; it is never used for isotope work, which the MVP does not model (§28.9, §40.6).

Z	Symbol	Conventional atomic weight (g/mol)
1	H	1.008
6	C	12.011
7	N	14.007
8	O	15.999
11	Na	22.98976928
12	Mg	24.305
13	Al	26.9815384
14	Si	28.085
16	S	32.06
19	K	39.0983
20	Ca	40.078
26	Fe	55.845
29	Cu	63.546
50	Sn	118.710

Pauling electronegativity

• Source: A. L. Allred, “Electronegativity values from thermochemical data”, J. Inorg. Nucl. Chem. 17:215–221 (1961), as tabulated in the CRC Handbook of Chemistry and Physics, 97th ed. Values are dimensionless, Pauling scale.
• Used by redox bookkeeping (§28.6); stored as NaN for any element with no accepted value (none in the current MVP set).

Ground-state electron configurations

• Source: NIST Atomic Spectra Database, ground-state configurations; cross-checked against the CIAAW periodic table. Cu is recorded with its real [Ar] 3d10 4s1 anomaly, not the naive 3d9 4s2.
• Descriptive only — used by the journal’s periodic table (§34.2), not by the solver.

Scope

Exactly the 14 stage-1 MVP elements of §36.2. The registry is append-only: later stages add rows, never remove or renumber them.