Complete each statement with the word that makes it true. The noble gases are the least
of any elements on the periodic table.

The
form acidic compounds with hydrogen.

The halogens are the most reactive among all the
.

The state or quality of being humid.a quantity representing the amount of water vapor in the atmosphere or a gas.

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  d.landing on and exploring the moon4. which of these space missions involved the deployment of lunar rovers d.apollo5. 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 exploration b. scientist must first develop certain technologies before missions can be completed.