29 Feature descriptors and symbols of the initial dataset for the investigated AB-type 2D nanomaterials. A and B represent the first and second elements in the chemical formula, respectively.

Symbol	Feature
S	Space group
SN	Space group number
AN/BN	Element amount of A or B
AIP/BIP	Ionization energy of A or B
ARa/BRa	Atomic radius of A or B
ARi/BRi	Ionic radius of A or B
AP/BP	Density of A or B
AEA/BEA	Electron affinity energy of A or B
ARC/BRC	Covalent radius of A or B
AE	Elastic modulus of A
Aq/Bq	Conductivity of A or B
Ac/Bc	Specific heat capacity of A or B
AH/BH	Heat of evaporation of A or B
ATB/BTB	Boiling point of A or B
ATM/BTM	Melting point of A or B
AV/BV	Atomic volume of A or B