The atomic size of atoms . A) increases going across a period B) decreases going down within a group C) increases going down within a group D) does not change going down within a group

i think   the answer is c hope i'm right

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.

it is stable as it is in group 0 which have full outer shells of electrons