active site / appropriate metal orbitals / metal atom / electrophilic metal surface / metal particles / metal atomic orbitals / chemical formula / metal vapor synthesis / metal ion valence electrons / chemical equation / metal particle / metal center / metal-free proteins / transition metal nanoclusters / water solution / transition metal / chemical energy / rate law / energy stabilization / Metal clusters / metal atoms / metal ions / aqueous solution / metal sites / metal particles centers / stabilized metal / energy / /