Electrons move in what is called an atoms electron plz me

What must occur for air masses to form fronts

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer

What rule is used to determine how many covalent bonds an element can form? a. the number of covalent bonds is equal to six c the number of covalent bonds is equal to five minus the group number plus the group number b. the number of covalent bonds is equal to eight d. none of the above minus the group number select the best answer from the choices provided