IN A TEST! NEED HELP

Compare the atomic radii of sodium and chlorine. Based on their positions in the periodic table,

A.) sodium has a larger radius because it is in column 1.

B.) sodium has a smaller radius because it is in column 1.

C.)chlorine has a larger radius because it is in column 17.

D.) their radii are equal because they are in the same period.

2. how is heavy water different from normal water

What factor besides temperature affects the boiling point of water? a. mass b. number of moles c. volume d. pressure

Northern was a learned a fairly cold climate caused by see one from the atlantic ocean, but se was real and tends to be much warmer, sonia look good causes difference. a.cool wins cannot blow across a leg into the south mountains, b.prevent cold air from blowing over into south sea,c.the south is at much higher elevation, so it is closer to the sun, d.suppose early and has a sperience a drastic climate change in the past few years.