HELP! How is the mass number of an atom calculated? A - total number of electrons

B - total number of protons

C - protons plus neutrons

D - electrons plus neutrons

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