Is the answer 0.47v or 0.65v? Because I used the 0.34v for the Cu but other people told me they used 0.52v

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