In a Lewis structure involving bromine and chlorine, if a central bromine atom has two lone pairs, how many chlorine atoms must be present

16. in a reaction that has reached equilibrium, a. the forward and reverse reactions are occurring at the same rate. b. the reactants and products are in equal concentrations. c. the forward reaction has gone further than the reverse reaction. d. there are equal numbers of atoms on both sides of the equation. e. a, b, and d are correct.

Answer asap : ( a. how does mucus prevent the entry of pathogens? b. describe two ways white blood cells protect us from pathogens.

What is the value of the standard enthalpy of formation of an element in its most stable form?