Which element, below, has the greatest atomic radius? A. aluminum
B. cobalt
C. iodine
D. barium

D. barium

Explanation:

Atomic size of an atom is defined as the total distance from the nucleus to the outermost shell of the atom.

On moving from left to right in a period, more and more electrons get added up in the same shell and the attraction between the last electron and nucleus increases, which results in the shrinkage of size of an atom. Thus, decreasing the atomic radii of the atom on moving towards right of the periodic table.

On moving from top to bottom, there is an addition of shell around the nucleus and the outermost shell gets far away from the nucleus and hence, the distance between the nucleus and outermost shell increases. Thus, increasing the atomic size of the atom.

Thus Barium has the graetest radius.

if the concentration of products is decreased, the equilibrium will shift toward the products). add an inert gas (one that is not involved in the reaction) to the constant-volume reaction mixture: this will increase the total pressure of the system, but will have no effect on the equilibrium condition.

explanation:

i believe the answer is a.