Transition metal
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Additive radii fitted for sixfold metal–metal bonding Additive covalent radii for sixfold metal-metal bonded dimers across transition metals and actinides with 12 valence electrons in (1σ)²(2σ)²π⁴δ⁴ configuration.
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CaCd2P2 stays stable under alkaline water oxidation CaCd2P2 Zintl phosphide absorbs visible light and resists photocorrosion through light-stabilized surface transformation, enabling stable photoelectrochemical water oxidation for solar fuel.

