What is the main focus of chemistry?

Chemistry is basically the science of chemicals. It is based on life experiences.

Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything.

the answer is c.the valence of the atoms combine .

c. orbital shape i hope this is correct