Table 1. Structure Parameters for Monolayers of VA Elements.

Element		N	P	As	Sb	Bi
Bulk (without vdW)	a	2.29	3.28	3.62	4.21	4.46
	Δz	0.70	1.24	1.40	1.62	1.71
	d	3.11	4.10	3.96	2.85	2.71
	l′	3.38	4.52	4.47	3.75	3.74
	lbond	1.50	2.27	2.51	2.92	3.09
Bulk (with vdW)	a	2.29	3.32	3.65	4.11	—
	Δz	0.70	1.21	1.37	1.64	—
	d	2.76	2.88	2.82	2.84	—
	l′	3.06	3.46	3.52	3.70	—
	lbond	1.50	2.27	2.51	2.89	—
Monolayer	a	2.30	3.28	3.61	4.12	4.33
	Δz	0.70	1.24	1.40	1.65	1.71
	lbond	1.50	2.26	2.51	2.89	3.09
Covalent radius33		0.71	1.07	1.19	1.39	1.48
vdW radius33		1.55	1.80	1.85	2.06	2.07
Unit in Å