Study of Hardness of Superhard Crystals by Topological Indices

Table 3

Structure symmetry, Randić index (R), atom-bond connectivity (ABC) index, calculated hardness (H), and their cumulative correlations (Cor) between (R, H) and (ABC, H).

Crystal	Symmetry	Randić index (R)	ABC index	Hardness of crystals	Cor (R, H)	Cor (ABC, H)
		14.136584	25.3452096	56.0	—	—
		5.77350269	9.11396154	65.8	−1	−1
		5.6090609	8.84196034	61.9	−0.911790078	−0.9128016
		5.60906090	8.84196034	64.8	−0.921902798	−0.92264538
		8.93265299	14.0612554	80.0	−0.267918644	−0.33848122
		12.4282032	9.62994735	74.0	−0.028477805	−0.39185327
		11.9423942	23.9924049	70.0	0.019298886	−0.23407776
		6.24264069	11.949383	77.6	−0.11272915	−0.26114031
		7.61383217	10.3762508	65.3	−0.092422184	−0.2263985
		7.56564615	12.6470418	80.7	−0.134370355	−0.22184915
		10.1941896	17.3528047	75.2	−0.096163473	−0.17150281
		22.8743687	34.3374432	65.4	−0.197758916	−0.24340232