[mdfcpczg] Elemental features

Chemical features: row (period) and group in periodic table, electronic orbital configuration, common ionic states and their electronic configuration, common hybridizations, electron energy levels between common excited states, forbidden transitions, electron affinity, ionization energy, symbol, name in several languages.

Nuclear features: number of protons, number of neutrons in stable or longest-lived isotopes, half lives of longest-lived isotopes, common decay modes and their probabilities, energy released in decay, energy levels and half-lives of excited nuclear states (e.g., metastable states).

Inspired by the useless task of memorizing the elements in alphabetical order.