What ions would the following elements form? Give the chemical symbol and the charge on the ion. [4] a. Rubidium RbBr b. Bromine

b. Barium BaSO4 d. Sulfur

Elements that do not have full outer electron shells will donate, share, or take electrons from other atoms. choose the items that have the correct binary ionic formula.

Which electron configuration represents the electrons in an atom of sodium in the ground state at stp

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