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In Ag 13 + core, one Ag atom sits in the centre and twelve surrounding Ag atoms forming eight Ag 3 and six Ag 4 faces. mario dandy ag The Ag 13 silver-centred core has been discovered in the experimental produced Ag 25 (SR) 18 − , [Ag 20 {S 2 P(OR) 2 } 12 ] and [Ag 21 {S 2 P(OiPr) 2 } 12 ] + superatom complexes (Dhayal et al. kasus ag 2015 ; Dhayal et al 2016