Question

Explain each of them briefly?

1) bond enthalpy trends?

2) Anomalies

Answer 1

A:- 1) Bond enthalpy:

                            The minimum amount of energy required for breaking of one mole covalent bond in gaseous state is called bond enthalpy.

Bond enthalpy is decreases from top to bottom in a group with increasing atomic radius and bond enthalpy is increases in a period across from left to right with decreasing atomic radius.

2) Anomalies: The first element every group shows anomalous properties than other elements in a group, because the first element has very small atomic radius.

Ex:- Be forms covalent compounds, where as the other elements forms ionic compounds