Which of the following best describes a pair of elements that will form an ionic bond?
O C and H: Hydrogen easily loses electrons, and carbon gains them.
O Li and O: Oxygen easily loses electrons, and lithium gains them.
O P and Cl: Phosphorus easily loses electrons, and chlorine gains them.
O Ca and Br: Calcium easily loses electrons, and bromine gains them.

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.

wher is the rest of the question

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