imagine you are a engineer designing a new cell phone. describe the criteria you would use, along with possible constraints and trade offs in the design process.

battery,phone cover,model of phone,plastic cover phone by rain oil or some harmful effects , need wire stricker to make phone good so the people buy it and some inner parts

b..

is the correct one

explanation:

covalent bonds form as valence electrons are shared between two atoms. lewis structures and structural formulas are common ways of showing the covalent bonding in organic molecules. formal charge describes the changes in the number of valence electrons as an atom becomes bonded into a molecule.