Which model from the supermarket best describes the arrangement of atoms in a
metal, such as copper, gold, or zinc?

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17

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

How many moles of bromine are needed to produce 3.23 moles of potassium bromide