What sodium and oxygen react to form of an ionic compound, the mass of the compound the sum of the masses of the individual elements

1) is less than
2) is greater than
3) is equal to
4) can be greater than or less than

Hope you find the answer

1. why does the same side of the moon always face earthc.the rotational period of the moon is equal to one revolution around earth2. which is greater the moons period of rotation or its period of revolution  b.the moons revolution period around earth3.what was the major accomplishment of the apollo missions  c.sending the first human into space4. which of these space missions involved the deployment of lunar roversa. voyager 15. which scientists are going to explore next on kepler-186fd. evidence of existence of life6.which mission is not going to explore the outside of the solar  systemb.safir7.which technology limit the future of space explorationb. scientist must first develop certain technologies before missions can be completed.

You can just look up the questions individually and get the answers