What are expections trends of atomic radius

It decreases from left to right along a period due to increasing number of electrons in the same shell along with equal increase in positive charge in the nucleus.

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.

the awnser is group 12