Mechanical properties of 2D IV–V monolayers in the Td4 structure. The units of elastic constants (C₁₁, C₁₂, and C₆₆) are in N m⁻¹.

System	C 11	C 12	C 66	Stability
SiP	81.30	66.57	57.41	Stable
SiAs	97.34	59.18	56.88	Stable
SiSb	78.86	43.05	46.39	Stable
GeP	115.65	44.18	54.90	Stable
GeAs	62.43	61.58	35.68	Stable
GeSb	37.68	37.68	32.89	Unstable
SnP	99.72	37.54	45.79	Stable
SnAs	68.31	74.71	49.20	Unstable
SnSb	75.21	35.17	44.503	Stable