Can anyone tell me which one I mad e a mistake for stress affect in the system?

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

Describe at least two advantages and two disadvantages of using hydropower as a source of energy.

Acompound has the molecular formula c3h8. which class of organic compounds does it belong to?