What is the increasing covalent order of pb3n4 and al203 and c2s3?

To determine the increasing covalent character among Pb3N4, Al2O3, and C2S3, we consider factors like electronegativity and bond type. Pb3N4 is primarily ionic but has significant covalent character due to lead's low electronegativity. Al2O3 has a more ionic character, but its covalent properties increase because of the aluminum's smaller size and higher charge density. C2S3 has a stronger covalent character due to the presence of nonmetals and the nature of its bonding, placing it as the most covalent among the three. Thus, the order is Pb3N4 < Al2O3 < C2S3.