I need help solving this table

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

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit

If 3 moles of a compound use 24 j of energy in a reaction, what is the a hreaction in j/mol?