Which element in the third period would you expect to have the larger atomic radius, sodium na or sulfur s?

                  Sodium (Na) has the larger Atomic Radius.

                           Remember there are three main factors which control or influence the atomic radius of elements.

i)  Electron Shells:

                             Greater the electron shells greater is the atomic radius and vice versa. As both Na ans S belongs to same group hence, this factor remains constant in both.

ii)  Nuclear Charge:

                               Greater the nuclear charge, smaller is the atomic radius and vice versa. As Na has less protons as compared to S, therefore its valence electrons will experience less Nuclear charge and will result in greater atomic radius as compared to S with more protons and greater Nuclear charge.

iii)  Shielding Effect:

                                The effect in which the core electrons shield the valence electron from nuclear attraction is know as Shielding effect. Greater the shielding effect greater is the atomic radius. In case of sodium and sulfur the shielding effect will remain same.

                   We can conclude that the size of Na is greater than Sulfur because of less Nuclear charge offered by sodium nucleus.

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.