ca and si
non polor
polar or ionic
CA and SI refer to the elements calcium (Ca) and silicon (Si), respectively.
Calcium (Ca) is a metallic element that forms ionic bonds when it reacts with other elements. This means that it tends to lose two electrons to form Ca2+ ions, which are attracted to negatively charged ions.
Silicon (Si) is a nonmetallic element that forms covalent bonds when it reacts with other elements. This means that it tends to share electrons with other atoms to complete its outer electron shell.
Therefore, calcium (Ca) forms ionic bonds, while silicon (Si) forms covalent bonds.