Can anyone me with 17 a, and b . these questions have to be right don’t need a bad grade!

A is covalent bond. B is " Covalent bonding is a form of chemical bonding between two non metallic atoms which is characterized by the sharing of pairs of electrons between atoms and other covalent bonds. Ionic bonds form when one atom gives up one or more electrons to another atom. "

a high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..

at positions a, g kinetic energy is maximum.

at position d, potential energy is maximum.